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HW | [
"$-2(x-1)-2(y+2)+1=0$",
"$-2 x+2-2 y-4+1=0$",
"$-2 x-2 y-1=0$",
"$2 x+2 y-1=0$",
"$\\displaystyle 2x+2y-1=0$ !!"
] |
|
HW | [
"$x^{2}+y^{2}-6 x+4 y=0 .$",
"$(x-3)^{2}+(y+2)^{2}=13 .$",
"์์ ์ค์ฌ์ด $\\displaystyle (3,-2)$์ด๋ฏ๋ก",
"$\\displaystyle a=-3, b=2$์ด๋ค.",
"๋ฐ์ง๋ฆ์ ๊ฐ์ผ๋ฏ๋ก $c=13$์ด๋ค.",
"$a+b+c=-3+2+13=12$",
"$12$"
] |
|
HW | [
"$\\displaystyle y={x}^{2}-2ax+9={(x-a)}^{2}+9-{a}^{2}$์ ๊ผญ์ง์ ์ ์ขํ๊ฐ",
"$\\displaystyle (a,9-{a}^{2})$ ์ด๋ฏ๋ก $\\displaystyle y$์ถ์ ๋ํด ๋์นญ์ด๋ํ ์ ์ ์ขํ๋",
"$\\displaystyle (-a, 9-{a}^{2})$์ด๋ค. ๋ฐ๋ผ์ ",
"$9-a^{2}=-a+5$",
"$a^{2}-a-4=0$",
"์ด๋ฏ๋ก $\\displaystyle a=\\frac{1 \\pm \\sqrt{17}}{2}$ ์ด๋ค. $\\displaystyle a$๋ ์์์ด๋ฏ๋ก $\\displaystyle a=\\frac{1+\\sqrt{17}}{2}$ ์ด๋ค.",
"$\\frac{1+\\sqrt{17}}{2}$"
] |
|
HW | [
"$\\displaystyle 5y=-2{x}^{2}+5$ ๊ฐ $\\displaystyle y$์ถ์ ๋ํด ๋์นญ์ด๋ํ ๋ํ์",
"$5 y=-2(-x)^{2}+5$",
"$=-2 x^{2}+5$",
"$2 x^{2}+5 y-5=0$",
"์ด๋ค.",
"$2 x^{2}+5 y-5=0$"
] |
|
HW | [
"$\\displaystyle 4y=4x+2$๊ฐ $\\displaystyle y=-x$์ ๋ํด ๋์นญ์ด๋ฏ๋ก",
"$\\displaystyle 4(-x) = 4(-y)+2 \\Rightarrow 4x=4y-2$ ์ด๋ค.",
"$4 x=4 y-2$"
] |
|
HW | [
"$x^{2}+y^{2}-10 x+8=0$",
"$(x-5)^{2}+y^{2}=17$",
"์์ ์ค์ฌ์ $(5,0)$์ธ๋ฐ $(3,1)$์ ๋์นญ์ด๋ํ๋ฉด",
"$\\displaystyle ( 1,2)$์ด๋ฏ๋ก",
"$(x-1)^2 +(y-2)^2 = 17$ ์ด๋ค.",
"$(x-1)^{2}+(y-2)^{2}=17$"
] |
|
HW | [
"$y=-2 x^{2}+8 x-2$",
"$=-2\\left(x^{2}-4 x\\right)-2$",
"$\\displaystyle =-2{(x-2)}^{2}+6$ $\\displaystyle \\to $ ๊ผญ์ง์ $\\displaystyle ( 2,6)$",
"$\\displaystyle x$์ถ์ผ๋ก $\\displaystyle a+2, \\; y$์ถ์ผ๋ก $\\displaystyle a$๋งํผ ํํ์ด๋",
"ํ๋ฉด, ๊ผญ์ง์ ์ $\\displaystyle (a+4, 6+a)$",
"$\\displaystyle x$์ถ ์์ ์์ผ๋ฏ๋ก $\\displaystyle a = -6$.",
"๊ผญ์ง์ ์ขํ๋ $\\displaystyle (-2, 0)$",
"$(-2,0)$"
] |
|
HW | [
"$(a,-1) \\rightarrow(1,-a) \\rightarrow(-1,-a+1)=(-1, b)$",
"$\\therefore a+b=1$",
"$1$"
] |
|
HW | [
"$\\displaystyle (a,2)$์ $\\displaystyle (-1,b)$์ ์ค์ ์ $\\displaystyle (4,-4)$ ์ด๋ฏ๋ก",
"$\\frac{a-1}{2}=4 . \\quad \\frac{b+2}{2}=-4 .$",
"$a=9, \\quad b=-10$",
"$a b=-90$",
"$-90$"
] |
|
HW | [
"์์ ์ค์ฌ์ด $(-3,-3)$ ์ด๋ฏ๋ก $x$์ถ์ ๋ํด ๋์นญ์ด๋ ",
"ํ๋ฉด $\\displaystyle ( -3,3 ) $์ด ๋๋ค. ๋ฐ๋ผ์ $\\displaystyle { ( x+3 ) }^{2}+{ ( y-3 ) }^{2} = 5$",
"์ด๋ค.",
"$(x+3)^{2}+(y-3)^{2}=5$"
] |
|
HW | [
"$P(0, a)$",
"์ $B$๋ฅผ $y$์ถ ๋์นญ์ด๋ ํ์ ๋์ ์ ์ $B'$",
"$\\displaystyle ( -1,4 ) $ ์ $\\displaystyle A,B'$ ๋ฅผ ์ง๋๋ ์ง์ ์",
"๋ฐฉ์ ์ $\\displaystyle y=-x+3$",
"$\\displaystyle P$๋ $\\displaystyle y$์ถ ์์ ์ ์ด๋ฏ๋ก $\\displaystyle (0,3)$",
"$P(0,3)$"
] |
|
HW | [
"์ $\\displaystyle A(5,3)$์ $\\displaystyle x$์ถ ์ชฝ์ผ๋ก $a$ ๋งํผ, $y$์ถ ์ชฝ์ผ๋ก $-5$ ๋งํผ",
"ํํ์ด๋ํ ์ $\\displaystyle B(5+a,-2)$์ ๋ํด",
"$\\overline{OA}=\\sqrt{5^{2}+3^{2}}=\\sqrt{34}$",
"$\\overline{O B}=\\sqrt{(5+a)^{2}+(-2)^{2}}=3 \\sqrt{34}$",
"์ด๋ฏ๋ก $(a+5)^{2}+4=306$์ด๋ค. ๋ฐ๋ผ์",
"$(a+5)^{2}=302$",
"$a=\\sqrt{302}-5(\\because a>0)$",
"์ด๋ค.",
"$\\sqrt{302}-5$"
] |
|
HW | [
"$x \\rightarrow x-2,\\quad y \\rightarrow y-m$",
"$\\displaystyle y-m = x-4 \\; \\gets ( 0,3 ) $ ์ง๋จ",
"$3-m=0-4, \\quad m=7$",
"$x \\rightarrow x-7$",
"$\\displaystyle y=-(x-n)+1 \\; \\leftarrow (0,3)$ ์ง๋จ",
"$3=-(-n)+1, \\quad n=2$",
"$m \\times n=7 \\times 2=14$",
"$14$"
] |
|
HW | [
"$(3,-1)$์์ $(-3,2)$๋ก ํํ์ด๋์ด ๋๋ ค๋ฉด",
"$\\displaystyle x$์ถ ๋ฐฉํฅ์ผ๋ก $\\displaystyle -6,y$์ถ ๋ฐฉํฅ์ผ๋ก $\\displaystyle 3$๋งํผ ์ด๋ํด์ผ ํ๋ค. ๋ฐ๋ผ์",
"$\\displaystyle (2,6) \\to (-4,9)$๋ก ์ด๋ํ๋ค.",
"$(-4,9)$"
] |
|
HW | [
"$x^{2}+y^{2}-6 x+8 y+2=0$",
"$(x-3)^{2}+(y+4)^{2}+2-9-16=0$",
"$(x-3)^{2}+(y+4)^{2}=23$",
"์ด๋ฏ๋ก $\\displaystyle a=-3,b=4,c=23$์ผ๋ก $\\displaystyle a+b+c=24$์ด๋ค.",
"$24$"
] |
|
HW | [
"$\\sqrt{(5-1)^{2}+(7-10)^{2}}=16+9=\\sqrt{25}=5$",
"$\\displaystyle \\overline{\\text{AP}}+\\overline{\\text{BP}}$์ ์ต์๊ฐ์ $\\displaystyle 5$์ด๋ค",
"$5$ !!"
] |
|
HW | [
"$\\displaystyle \\overline{\\text{O\\text{A}}}=\\sqrt{{5}^{2}+{3}^{2}}=\\sqrt{34}$ ์ด๋ฏ๋ก, ์ฎ๊ฒจ์ง ์ $\\displaystyle A'(5+a,$",
"$\\displaystyle -3$)์ ๋ํด",
"$\\overline{O A}^{2}=(5+a)^{2}+9=(3 \\sqrt{34})^{2}=306$",
"$(5+a)^{2}=297$",
"$a=-5+\\sqrt{33}(\\because a>0)$",
"์ด๋ค.",
"$-5+\\sqrt{33}$"
] |
|
HW | [
"$P$",
"$\\sqrt{1+4}=\\sqrt{5}$",
"ok",
"good.",
"$\\sqrt{5}$"
] |
|
HW | [
"$\\displaystyle \\overline{\\text{OA}}=\\sqrt{{5}^{2}+{2}^{2}}=\\sqrt{29}$ ์ด๋ฏ๋ก, ์ฎ๊ฒจ์ง ์ ์ $\\displaystyle A'$๋ผ๊ณ ",
"ํ๋ฉด $\\displaystyle \\text{A}^\\prime (5+a,-2)$์ ๋ํด $\\displaystyle \\overline{\\text{OA}'}=3\\sqrt{29}$์ด๋ค. ๋ฐ๋ผ์",
"$(5+a)^{2}+4=261 \\rightarrow 5+a=\\sqrt{257}(\\because a>0$",
"$a=-5+\\sqrt{257}$",
"์ด๋ค.",
"$-5+\\sqrt{257}$"
] |
|
HW | [
"$y=-x$์ ๋์นญ์ด๋ํ๋ฉด",
"$\\displaystyle x$ ๋์ $\\displaystyle -y$, $\\displaystyle y$ ๋์ $\\displaystyle -x$๋ฅผ ๋์
ํ๋ค.",
"$(-1,-9)$",
"$(-1,-9)$"
] |
|
HW | [
"P์ ์ขํ๋ $\\displaystyle (2,4)$์ด๊ณ ",
"$\\displaystyle Q$์ ์ขํ๋ $\\displaystyle (-4,2)$์ด๋ค.",
"$\\overline{PQ}=\\sqrt{(2+4)^{2}+(4-2)^{2}}=\\sqrt{40}$",
"$\\sqrt{40}$"
] |
|
HW | [
"x ๋ฐฉํฅ $\\displaystyle -4 \\; \\; : \\; \\; \\; x \\to x+4$",
"$\\displaystyle y$๋ฐฉํฅ $\\displaystyle 2$ : $\\displaystyle y \\to y-2$",
"$y-2=-(x+4)^{2}+3(x+4)+2$",
"$y=-x^{2}-8 x-16+3 x+12+2+2$",
"$=-x^{2}-5 x$",
"$y=-x^{2}=5 x$"
] |
|
HW | [
"$y=\\left(x^{2}+4 x+4\\right)-9=(x+2)^{2}-9$",
"$x \\rightarrow x+y$",
"$y\\rightarrow y-3$",
"$y-3=(x+6)^{2}-9$",
"$y=(x+6)^{2}-6$",
"$(a, b)=(-6,-6)$",
"$a-b=0$",
"$0$"
] |
|
HW | [
"$x$์ถ ๋์นญ์ $y$์ขํ์ ๋ถํธ๋ฅผ ๋ฐ๋๋กํ๋ฏ๋ก",
"$(0,5) \\rightarrow(0,-5)$",
"์ด๋ค.",
"$(0,-5)$"
] |
|
HW | [
"์ด๋๋ ์์ ์ค์ฌ์ด $\\displaystyle (4,a)$์ด๋ฏ๋ก",
"$\\frac{|12+2 a-7|}{\\sqrt{3^{2}+2^{2}}}=\\sqrt{13} \\Rightarrow|12+2 a-7|=13$",
"$ 2a=8$ ๋๋ $ 2a=-18$",
"$a=4(\\because a>0)$",
"์ด๋ค.",
"$4$"
] |
|
HW | [
"$\\displaystyle (a,2)$์ $\\displaystyle (-2,b)$์ ์ค์ ์ด $\\displaystyle (5,-1)$์ด๋ฏ๋ก",
"$\\frac{a-2}{2}=\\frac{1}{5}, \\quad \\frac{b+2}{2}=-1$",
"$a-2=10 \\quad b+2=-2$",
"$a=12 \\quad b=-4$",
"$a b=-48$",
"$-48$."
] |
|
HW | [
"$(2,0) \\rightarrow (-4,4)$๋ $x$์ถ ๋ฐฉํฅ์ผ๋ก $-6$, $y$์ถ ๋ฐฉํฅ์ผ๋ก",
"$\\displaystyle 4$๋งํผ ํํ์ด๋ํ๋ ๊ฒ์ด๋ฏ๋ก $\\displaystyle (2,6)$ ์ $\\displaystyle (-4,10)$์ผ๋ก ์ฎ๊ฒจ",
"์ง๋ค.",
"$(-4,10)$"
] |
|
HW | [
"$(x-1)^{2}+(y-1)^{2}=-a+2$",
"$(x+a)^{2}+(y-5)^{2}=-a+2$",
"ok",
"ํํ์ด๋",
"์์ ์ค์ฌ $\\displaystyle ( -4,5 ) = ( b,5 ) $",
"$b=-4,\\quad -a+2=4 \\quad a=-2$",
"$\\displaystyle a+b=-6$",
"$-6$"
] |
|
HW | [
"$(6,-3)$",
"$P(6,3)$",
"$Q(-3,6)$",
"$\\sqrt{(6+3)^{2}+(3-6)^{2}}=\\sqrt{81+9}=3 \\sqrt{10}$",
"$3\\sqrt{10}$"
] |
|
HW | [
"์ $(-7, 5)$๋ฅผ $y=x$ ๋์นญ์ด๋ํ๋ฉด $(5,-7)$์ด๋ค. ์ดํ",
"์์ ๋์นญํ๋ฉด $\\displaystyle (-5,7)$์ด ๋๋ค. ์ด๋ $\\displaystyle y = -x$ ๋์นญ๊ณผ ๊ฐ๋ค.",
"๋ฐ๋ผ์ $3x+2y-3=0$์ $y=-x$์ ๋ํด ๋์นญ์ด๋ํ๋ฉด",
"$3(-y)+2(-x)-3=0$",
"$2 x+3 y+3=0$",
"์ด๋ค.",
"$2 x+3 y+3=0$"
] |
|
HW | [
"์ง์ $\\displaystyle 2x+2y+k=0$์ ์์ ์ ๋ํด ๋์นญ์ด๋ํ๋ฉด",
"$2(-x)+2(-y)+k=0$",
"$2 x+2 y-k=0$",
"์ด๋ค. ํํธ ์ $\\displaystyle {(x-5)}^{2}+{(y-1)}^{2}=4$์ ์ค์ฌ์ ์ขํ๋",
"$(5,1),$ ๋ฐ์ง๋ฆ์ $2$์ด๋ฏ๋ก,",
"$\\frac{|2 \\times 5+2 \\times 1-k|}{\\sqrt{2^{2}+2^{2}}}=2$",
" $|12-k|=4 \\sqrt{2}$",
"$k=12 \\pm 4 \\sqrt{2}$",
"์ด๋ค. ๋ฐ๋ผ์ $\\displaystyle (12+4\\sqrt{2})+(12-4\\sqrt{2)}=24$์ด๋ค.",
"24"
] |
|
HW | [
"์ด๋ค ์ง์ ์ $\\displaystyle (-4,4)$๋ฅผ ์ง๋๋ฏ๋ก",
"$ y = -x$ ์ ๋ํ ๋์นญ์ด๋์ด๋ค.",
"๋ ๋ผ์, $\\displaystyle x$๋์ $\\displaystyle -y$, $\\displaystyle y$๋์ $\\displaystyle -x$๋ฅผ",
"๋์
ํ๋ฉด",
"$-3 y-3 x-4=0$",
"$3 x+3 y+4=0$"
] |
|
HW | [
"$\\displaystyle y = 5 {x}^{2}+5 x+1$ ์ด $\\displaystyle y = -x $์ ๋ํ์ฌ ๋์นญ์ด๋ํ ๋ํ์ ",
"๋ฐฉ์ ์์ $\\displaystyle -x=-5 {y}^{2}-5 y+1$",
"$\\displaystyle x=5 {y}^{2}+5 y-1$ ์ด๋ค.",
"์๋ํ๋ฉด $\\displaystyle y=-x$์ ๋์นญ์ด๋ํ๋ฉด $\\displaystyle (x,y) \\to (-y,-x)$๊ฐ",
"๋๊ธฐ ๋๋ฌธ์ด๋ค. ",
"$y=5 y^{2}+5 y-1$"
] |
|
HW | [
"$\\displaystyle x$์ถ์ผ๋ก $\\displaystyle -2, \\; y$์ถ์ผ๋ก $\\displaystyle 3$๋งํผ ํํ์ด๋ํ๋ฉด,",
"$y-3=-(x+2)^{2}+4(x+2)-1$",
"$y=-x^{2}+6$",
"$y=-x^{2}+6$"
] |
|
HW | [
"์์ ๋์นญ์ด๋ํ๋ฉด ๋ฐ์ง๋ฆ์ ๊ทธ๋๋ก์ด๋ ์ค์ฌ์ ์ขํ๋ง",
"๋ฐ๋๋ฏ๋ก, ์ค์ฌ์ ์ขํ๊ฐ $(-2,4)$์ด๊ณ ๋ฐ์ง๋ฆ์ด $k$์ธ ์์ด",
"์์ ๋์นญ์ด๋ํ๋ฉด ๋ฐ์ง๋ฆ์ ๊ทธ๋๋ก์ด๋ ์ค์ฌ์ ์ขํ๋ง ๋ฐ๋๋ฏ๋ก, ์ค์ฌ์ ์ขํ๊ฐ $\\displaystyle (-2, 4)$์ด๊ณ ๋ฐ์ง๋ฆ์ด $\\displaystyle k$์ธ ์์ด ๋๋ค. ๋ฐ๋ผ์\n$\\displaystyle {(x+2)}^{2}+{(y-4)}^{2}={k}^{2}$\n์ธ๋ฐ, ์ด ์์ด ์ $\\displaystyle (-2, -5)$๋ฅผ ์ง๋๋ฏ๋ก\n$\\displaystyle {0}^{2}+{(-9)}^{2}={k}^{2}$\n\n$\\displaystyle \\Rightarrow k=9$ ์ด๋ค.\n\n$\\displaystyle \\therefore k = 9$",
"$(x+2)^{2}+(y-4)^{2}=k^{2}$",
"์ธ๋ฐ, ์ด ์์ด ์ $\\displaystyle ( -2,-5 ) $๋ฅผ ์ง๋๋ฏ๋ก",
"$0^{2}+(-9)^{2}=k^{2}$",
"$k=q$",
"์ด๋ค.",
"9"
] |
|
HW | [
"$\\displaystyle x$์ถ",
"$(18,10)$",
"๋์นญ์ด๋",
"$(18,-10)$",
"$(18,-10)$"
] |
|
HW | [
"$\\displaystyle {x}^{2}+{y}^{2}-2x-2y+a=0$ ์ด๋ฏ๋ก",
"$(x-1)^2+(y-1)^2+a-2=0$์ด๋ค. ๋ฐ๋ผ์ ์์",
"์ค์ฌ์ $\\displaystyle (1,1)$์์ $\\displaystyle (-2,4)$๋ก ์ฎ๊ฒจ์ง๋ฏ๋ก",
"$2-a=25 \\rightarrow a=-23$",
"$b=-2$",
"์ด๋ฏ๋ก $\\displaystyle a+b=-25$์ด๋ค.",
"$-25$"
] |
|
HW | [
"$\\displaystyle y$๋์ $\\displaystyle -y$๋ฅผ ๋์
ํ๋ฉด,",
"$-6 y=6 x^{2}-x+1$",
"$y=-x^{2}+\\frac{1}{6} x-\\frac{1}{6}$",
"$y=-x^{2}+\\frac{1}{6} x-\\frac{1}{6}$"
] |
|
HW | [
"$a=-8, \\quad 8=-1$",
"๊ทธ๋ํ๋ฅผ ๊ทธ๋ ค๋ณด๋ฉด ์์์ด ์กฐ๊ธ ๋ ๊น์?",
"$\\displaystyle x$์ $\\displaystyle y$ ๊ฐ์ด ๋ฐ๋๋ก ๊ฐ์",
"์ ์ ์์๊น์?"
] |
|
HW | [
"$4 x+y-6=0$",
"$4(x+5)+(y-4)-6=0$",
"$4 x+y+10=0$",
"์ด๋ฏ๋ก $p=1$, $q=10$์ผ๋ก $p+q = 11$์ด๋ค.",
"11"
] |
|
HW | [
"$(a, 2) \\quad(-1, b)$",
"$\\frac{a-1}{2}=2, a-1=4, a=5 .$",
"$\\frac{2+b}{2}=-5,2+b=-10, b=-12$",
"$a \\times b=5 \\times(-12)=60$",
"$-60$"
] |
|
HW | [
"์ $\\displaystyle {(x+1)}^{2}+{(y+5)}^{2}=1$์ ์ค์ฌ์ $\\displaystyle (-1,-5)$์ด๋ฏ๋ก",
"$\\displaystyle x$์ถ์ ๋ํด ๋์นญ์ด๋ํ๋ฉด $\\displaystyle (-1,5)$์ด๋ค. ๋ฐ๋ผ์",
"$(x+1)^{2}+(y-5)^{2}=1$",
"์ด๋ค.",
"$(x+1)^{2}+(y-5)^{2}=1$"
] |
|
HW | [
"$y=(x-4)-2+m$",
"$ y=-(x-n)+1 \\quad $์ ๊ต์ ์ด $ (0,3)$์ด๋ฏ๋ก",
"$3=-3+m, m=6$",
"$3=n+1 \\quad n=2$ .",
"$mn=12$",
"$12$"
] |
|
HW | [
"์ $\\displaystyle A(4,-1)$์ $\\displaystyle x$์ถ ๋ฐฉํฅ์ผ๋ก $\\displaystyle a$, $\\displaystyle y$์ถ ๋ฐฉํฅ์ผ๋ก $\\displaystyle -6$๋งํผ",
"ํํ์ด๋ํ ์ $\\displaystyle \\text{A}' ( 4+a, -7 ) $์ ๋ํด",
"$\\overline{O A}=\\sqrt{4^{2}+1^{2}}=\\sqrt{17}$",
"์ด๋ฏ๋ก $\\displaystyle \\overline{OA'}=3\\sqrt{17}$์ด๋ค. ๋ฐ๋ผ์",
"$(a+4)^{2}+49=9 \\times 17=153$",
"$(a+4)^{2}=104$",
"$a+4=2 \\sqrt{26}(\\because a>0)$",
"$a=2 \\sqrt{26}-4$",
"์ด๋ค.",
"$2 \\sqrt{26}-4$"
] |
|
HW | [
"$2 X-2 B=2 A+4 B$",
"$5.$",
"$X=A+3 B$",
"์ ๋ฆฌ good!",
"$=7x^{2}+xy+6 y^{2}+3(-3x^{2}+5xy $",
"$\\left.+6 4^{2}\\right)$",
"$=-2 x^{2}+16 x y+24 y^{2}$",
"๊ณ์ฐ ์ ํ์
จ์ด์!"
] |
|
HW | [
"โซ $x^{4}+5x^{3}+11x^{2}+15x+9=A\\left(x^{2}+3x+4\\right)+4x+5$",
"$x^{4}+5 x^{3}+11 x^{2}+11 x+4=A\\left(x^{2}+3 x+4\\right) .$",
"$A=x^{2}+2 x+1$"
] |
|
HW | [
"๋ฌธ์ $\\displaystyle 3$",
"Good!!",
"$5 x-5 x^{2}-2+17 x^{3}$",
"$17 x^{3}-5 x^{2}+5 x-2$",
"๋ต:$\\displaystyle 17{x}^{3}-5{x}^{2}+5x-2$"
] |
|
HW | [
"๋ฌธ์ $\\displaystyle 7$",
"perfect!!",
"$(3 x-2)(3 x+2)\\left(3^2 x^{2}+2^{2}\\right)\\left(3^{4} x^{4}+2^{4}\\right)=\\left(3^{2} x^{2}-2^{2}\\right)\\left(3^2 x^2+2^{2}\\right)\\left(3^4 x^{4}+2^{4}\\right)=\\left(3^4x^4-2^4\\right)\\left(3^{4} x^{4}+2^{4}\\right)=$",
"$\\displaystyle ({3}^{2}{x}^{2}-{2}^{3})={3}^{9}-{2}^{8}=19683-19427$ ๋ต:$\\displaystyle 19+27$"
] |
|
HW | [
"์์ ๊ณ์๋ฅผ ๊ผผ๊ผผํ ๋ด
์๋ค.",
"49. โ $-16ab(4a+4b-4c)$",
"$=-64 a^{2} b-64 a b^{2}+64 a b c$",
"โก $\\displaystyle {(4 a)}^{3}+{(4 b)}^{3}+{(-4 c)}^{3}-3(-64 a b c)$",
"$=64 a^{3}+64 b^{3}-64 c^{3}+192 a b c$",
"$\\text{โ }+\\text{โก} = 64 a^3 + 64b^3 - 64c^3 - 64a^2b$",
"$-64 a b^{2}+236 a b c$"
] |
|
HW | [
"$x^{3}+\\frac{1}{x^{3}}=\\left(x+\\frac{1}{x}\\right)^{3}-3\\left(x+\\frac{1}{x}\\right)$",
"$x^{2}+\\frac{1}{x^{2}}=\\left(x+\\frac{1}{x}\\right)^{2}-2=12$",
"$\\left(x+\\frac{1}{x}\\right)^{2}=14, ~~x+\\frac{1}{x}=\\sqrt{14} .$",
"$x^{3}+\\frac{1}{x^{3}}=14 \\sqrt{14}-3 \\sqrt{14}$",
"Perfect!!",
"$=11 \\sqrt{14}$",
"$11 \\sqrt{14}$"
] |
|
HW | [
"ใท",
"$x^{3}-9 x^{2}+20 x-12$",
"Good!"
] |
|
HW | [
"6. $(a-b)^{2}=a^{2}-2 a b+b^{2}$",
"$=a^{2}+2 a b+b^{2}-4 a b$",
"good",
"$=(a+b)^{2}-4 a b$",
"$=16+40=56$",
"์ ์ ๋ฆฌํ์์ต ๋๋ค!"
] |
|
HW | [
"good.",
"9. $\\displaystyle {x}^{3}-{y}^{3}=(x-y)({x}^{2}+xy+{y}^{2})$",
"$=2 \\sqrt{7}\\left\\{(3+\\sqrt{7})^{2}+2+(3-\\sqrt{7})^{2}\\right\\}$",
"$=2 \\sqrt{7} \\times 34$",
"$=68 \\sqrt{7}$"
] |
|
HW | [
"$8$. $\\displaystyle x^{3} + \\frac{1}{x^3} = {\\left(x+\\frac{1}{x}\\right)}^3 - 3 \\left(x+\\frac{1}{x}\\right)$",
"good!",
"$=27-9$",
"$=18$"
] |
|
HW | [
"$x^{3}-y^{3}=(x-y)^{3}+3 x y(x-y)$",
"$x-y=5+\\sqrt{7}-(5-\\sqrt{7})=2 \\sqrt{7}$",
"$x y=(5+\\sqrt{7})(5-\\sqrt{7})=25-7=18$",
"$=(2 \\sqrt{7})^{3}+3 \\cdot 18 \\cdot 2 \\sqrt{7}$",
"$=56 \\sqrt{7}+108 \\sqrt{7}$",
"$=164 \\sqrt{7}$",
"์ํ์ด์~!",
"$164 \\sqrt{7}$"
] |
|
HW | [
"20. $A \\ast B = 9A - 9B$",
"$9\\left(x^{2}+2 x+9y+1\\right)-9(-2 x-y-8)$",
"$=9 x^{2}+18 x+81y+9+18 x+9y+72$",
"$=9 x^{2}+36 x+90y+81$",
"์ ๊ณ์ฐํ์ด์!"
] |
|
HW | [
"$x+y=1, \\quad x y=-3$",
"$x^{2}-x y+y^{2}=(x+y)^{2}-3 x y$",
"$=1^{2}-3 \\times(-3)$",
"$=1+9$",
"์ํ์ด์~",
"$=10$",
"$10$"
] |
|
HW | [
"$\\frac{x^{4}+5 x^{3}+12 x^{2}+20 x+7}{A}$",
"$\\doteq x^{2}+3 x+1 \\quad \\cdots \\quad 3 x+2$",
"$x^{4}+5 x^{3}+12 x^{2}+20 x+7$",
"$=(\\text{๋๋๋ ๋คํญ์}) \\times \\text{๋ชซ} + \\text{๋๋จธ์ง}$ .",
"์ด๋ค ๊ฐ๋
์ด์ฉํด์ผ ํ๋์ง",
"๋ชจ๋ฅด๊ฒ ์ด์",
"๋ค์ ํ ๋ฒ ํ์ด ๋ณด์ธ์ ."
] |
|
HW | [
"45. $ (x-y)^{2}=x^{2}-2 x y+{y}^{2}$์์",
"$16=8-2 x y$",
": ๋์
์ ํ์ด์.",
"$x y=-4$",
"$x^{3}-y^{3}=(x-y)\\left(x^{2}+x y+y^{2}\\right)$",
"$=-4(8-4)$",
"$=-16$"
] |
|
HW | [
"$P(x)=\\left(x^{2}-2 x+1\\right)(x-2)-3 x+6$",
"$=x^{3}-2 x^{2}-2 x^{2}-4 x+x-2-3 x+6$",
"$$",
"$=x^{3}-4 x^{2}-6 x+4$",
"$=x^{3}-4 x^{2}+2 x+4$",
"$x^{3}-4 x^{2}-6 x+4$"
] |
|
HW | [
"Good!\n",
"๋ฌธ์ $\\displaystyle 6$",
"$=\\frac{(1+5)(1-5)\\left(1^{2}+5^{2}\\right)\\left(1^{4}+5^{4}\\right)}{4}=\\frac{\\left(1^{2}-5^{2}\\right)\\left(1^{2}+5^{2}\\right)\\left(1^{4}+5^{4}\\right)}{4}=\\frac{\\left(1^{4}-5^{4}\\right)(1^4+5^4)}{4}= \\frac{\\left(1^{8}-5^{8}\\right)}{4}=-\\frac{\\left(5^{8}-1^{8}\\right)}{4}$",
"perfect!",
"๋ต: $97656$",
"$=\\frac{390625-1}{4}=\\frac{390624}{4} =97656$"
] |
|
HW | [
"3)",
"$(x-y)^{2}=x^{2}-2 x y+y^{2}$",
"$1=9-2 x y$",
"$\\therefore x y=4$",
"$(x-y)^{3}=x^{3}-y^{3}-3 x y(x-y)$",
"$1=x^{3}-y^{3}-12$",
"$\\therefore x^{3}-y^{3}=13$"
] |
|
HW | [
"$c-a=-(a-b+b-c)=-5$",
"$a^{2}+b^{2}+c^{2}-a b-b c-c a=$",
"$\\frac{1}{2}\\left\\{(a-b)^{2}+(b-c)^{2}+(c-a)^{2}\\right\\}$",
"$=\\frac{1}{2}\\left\\{9+4+(-5)^{2}\\right\\}$",
"$=\\frac{1}{2}\\{9+4+25\\}$",
"Perfect!!",
"$=\\frac{1}{2} \\times 38$",
"$=19$",
"$19$"
] |
|
HW | [
"$x+y=-7, \\quad xy=7$",
"$x^{2}-x y+y^{2}=(x+y)^{2}-3 x y$",
"$x^{2}-x y+y^{2}=49-21=28$",
"Good !",
"$28$"
] |
|
HW | [
"๋ด๋ฆผ์ฐจ์$\\displaystyle \\to $์ฐจ์๊ฐ ํฐ ํญ๋ถํฐ.",
"$7 x^{3}-8 x^{2}+7 x-4$",
"good!",
"$7 x^{3}-8 x^{2}+7 x-4$"
] |
|
HW | [
"$7 x-8 x^{2}-5+14 x^{3}=14 x^{3}-8 x^{2}+7 x-5$",
"$14 x^{3}-8 x^{2}+7 x-5$"
] |
|
HW | [
"$\\left(x^{2}+y\\right)^{2}(x-y)+x^{2} y-x y^{2}$",
"$8 \\times(-6)$"
] |
|
HW | [
"1) $a+b+c=0$",
"$2>\\quad a^{2}+b^{2}+c^{2}=10$",
"$(a+b+c)^{2}=a^{2}+b^{2}+c^{2}+2(a b+b c+(a)$",
"$a^{2}+b^{2}+c^{2}=(a+b+c)^{2}-2(a b+b c+c a)$",
"$-\\frac{1}{2}(10\\quad =-2(a b+b c+c a))$",
"$-5=a b+b c+c a$",
"$a^{4}+b^{4}+c^{4}=\\left(a^{2}+b^{2}+c^{2}\\right)^{2}$",
"$=10^{2}$",
"$=100$",
"๋ต$\\displaystyle :100$"
] |
|
HW | [
"$\\left(4 a^{2}+25 b^{2}+c^{2}+10 a b+5 b c+2 a c\\right)$",
"$\\left(4 a^{2}+25 b^{2}+c^{2}+5 b c-10 a b-2 a c\\right)$",
"$\\left(4 a^{2}+25 b^{2}+c^{2}-10 a b-5 b c+2 a c\\right)$",
"$\\left(4 a^{2}+25 b^{2}+c^{2}+10 a b-5 b c-2 a c\\right)$",
"$=16 a^{2}+100 b^{2}+4 c^{2}$",
"์ข์์! ์ข์ ํ์ด์์!",
"$16 a^{2}+100 b^{2}+4 c^{2}$"
] |
|
HW | [
"๋ฌธ์ $\\displaystyle 1$",
"$5 x+2\\left(2 x^{2}-x y+4 y^{2}\\right)=-3\\left(3 x-2 x y+6 y^{2}\\right)$",
"Perfect!!",
"$5 x+4 x^{2}-2x y+8 y^{2}=-9 x^{2}+6 x y-18 y^{2}$",
"$5 x=-13 x^{2}+8 x y-26 y^{2}$",
"$x=\\frac{-13}{5} x^2+\\frac{8}{5} x y-\\frac{26}{5} y^{2} \\quad$ ๋ต $: \\frac{-13}{5} x^{2}+\\frac{8}{5} x y-\\frac{26}{5} y^{2}$"
] |
|
HW | [
"$(3 x+2) \\times(3 x+2)$",
"$(a+b)^{2}=a^{2}+2 a b+b^{2}$",
"$9 x^{2}+12 x+4$",
"์ข์์!",
"์ข์ ํ์ด์์!",
"$9 x^{2}+12 x+4$"
] |
|
HW | [
"Hi my name is yundo!",
"$81 a^{2}+45 a-45 a$",
"good!",
"$81 a^{2}-25$"
] |
|
HW | [
"๋ฌธ์ $\\displaystyle 4$",
"$\\displaystyle (9x+3)(x-8)$์ ๋ถ๋ฐฐ๋ฒ์น์ ์ด์ฉํ์ฌ ํ๋ฉด $\\displaystyle 9{x}^{2}+(-72+3)x-24 \\; , \\; 9{x}^{2}-69x-24$์ด๋ค.",
"Perfect!!",
"๋ต: $\\displaystyle 9{x}^{2}-69x-24$"
] |
|
HW | [
"46. $\\displaystyle (6 a+2 b-2 c)(36 {a}^{2}+4 {b}^{2}+4 {c}^{2}-12 a b$",
"$4 b c+12 a c)=216 a^{2}+8 b^{2}-8 c^{2}$",
"$\\displaystyle +72abc$ ์์",
"$-12 a b(6 a+2 b-2 c)$",
"$=-72 a^{2} b-24 a b^{2}+24 a b c$",
"$\\therefore 216 a^{2}+8 b^{2}-8 c^{2}-72 a^{2} b-24 a b^{2}+$",
"$96 a b c$",
"๋ฌธ์ ๋ฅผ ์ ๋ชป ๋ณด์
จ์ต๋๋ค."
] |
|
HW | [
"$A-2 A+2 B+C$",
"$=-A+2 B+C$",
"$=-\\left(2 x^{3}+8 x^{2}+3 x+4\\right)$",
"$2\\left(-7 x^{2}+x-2\\right)$",
"$-x^{3}+3 x^{2}-4 x-1$",
"$=-2 x^{3}-8 x^{2}-3 x-4$",
"๋๊น์ง ๊ณ์ฐํด๋ด์!",
"$-14 x^{2}+2 x-4$"
] |
|
HW | [
"$\\left(2 x^{2}-x-8\\right)\\left(x^{2}-2 x+k\\right)$",
"$\\displaystyle x$์ ๊ณ์ $\\displaystyle : -k + 16 = 6$",
"$\\therefore k=10$",
"Good!",
"$10$"
] |
|
HW | [
"ใต",
"$-35 a b-2 a b=-37 a b$",
"$-37$",
"Good!"
] |
|
HW | [
"$(7x+3)(4x-5)=28x^{2}+(-35+12)x-15$",
"$28x^2 + (-35+12)x-15$",
"Perfect!",
"$28x^{2}-23 x-15$"
] |
|
HW | [
"๋คํญ์ $\\displaystyle 10 x-3 {x}^{2}-17+4 {x}^{3}$ ์",
"$\\displaystyle x$์ ๋ํ ์ค๋ฆ ์ฐจ์์ผ๋ก ์ ๋ฆฌํ์์ค",
"$4 x^{3}-3 x^{2}+10 x-17$",
"์ฉ์ด ๋๋ฌธ์ ํ๊ฐ๋ ธ๋ ๊ฒ ๊ฐ์์!",
"$4 x^{3}-3 x^{2}+10 x-17$"
] |
|
HW | [
"$(x-3)(x+3)(x-8)$",
"$\\left(x^{2}-9\\right)(x-8)$",
"$x^{3}-8 x^{2}-9 x+7=$",
"์ํ์ด์!",
"$a-b =$",
"$x^{3}-8 x^{2}-9 x+72$"
] |
|
HW | [
"$-k x+36 x=2$",
"$k=34$",
"์ข์์! ์ข์ ํ์ด์์.",
"$34$"
] |
|
HW | [
"$-5\\left(x^{2}+2 x-54+1\\right)+5(3 x-y+6)$",
"$-5 x^{2}-10 x+254-5+15 x-54+30$",
"$=-5 x^{2}+5 x+209+25$",
"์ข์์,์ข์ ํ์ด์์.",
"$-5 x^{2}+5 x+20y+25$"
] |
|
HW | [
"42. $\\displaystyle {x}^{2}+5 x-1=0$",
"์ ๋ฆฌ ์ ํ์ต๋๋ค.",
"$x-\\frac{1}{x}=-5$",
"$x^{3}-\\frac{1}{x^{3}}=\\left(x-\\frac{1}{x}\\right)^{3}+3\\left(x-\\frac{1}{x}\\right)$",
"$=-125-15$",
"$=-140$"
] |
|
HW | [
"$7 x-2 x^{2}-15+5 x^{3}$",
"$-15+7 x-2 x^{2}+5 x^{3}$",
"์ํ์ด์!",
"$-15+7x-2 x^{2}+5 x^{3}$"
] |
|
HW | [
"$\\left(x^{2}+y^{2}\\right)(x-y)=x^{3}-y^{3}$",
"$6 \\times 5=30$",
"๋ค์ ํ ๋ฒ ํ์ด๋ณผ๋์?",
"์๊ณ ์๋ ๊ณต์์ ํ์ฉํด ๋ด์.",
"$30$"
] |
|
HW | [
"$(-x-1)(-x-2)(-x-3) \\cdots(-x-10)$",
"12.",
"$\\displaystyle x^9$์ ๊ณ์:$\\displaystyle 1+2+3 \\cdots +10\n$",
"$=11 \\times 5=55$",
"์ ๊ณ์ฐํ์ด์!"
] |
|
HW | [
"$x+y=-9 \\quad x y=7 $",
"$x^{2}-x y+y^{2}=(x-y)^{2}+x y$",
"$=81+7$",
"$=88$"
] |
|
HW | [
"$10x-{x}^{2}-16+3 {x}^{3}$์ ์ค๋ฆ์ฐจ์์ผ๋ก ์ ๋ฆฌ",
"์๋ฏธ๋ฅผ ๋ค์",
"$3 x^{3}-x^{2}+10 x-16$",
"์๊ฐํด๋ณด์ธ์!",
"๋ด๋ฆผ์ฐจ์",
"$ 3x^{3}-x^{2}+10x-16$"
] |
|
HW | [
"$\\displaystyle x$์ ๊ณ์๊ฐ $\\displaystyle 11$์ ๋๋ ์๋ฅผ ๋นผ๋ฉด",
"$\\displaystyle {(1+x+2{x}^{2}+ \\cdots +10{x}^{10})}^{2}$์ด ๋๋ค.",
"๊ทธ์ค $x$์ ๊ณ์๊ฐ $10$์ผ ์ ์๋๋ก ํ๊ฒ ์กฐํฉํ๋ฉด",
"$10x^{10}+\\left(9 x^{9} \\times x\\right)+\\left(8 x^{2} \\times 2 x^{8}\\right) \\cdots+\\left(x \\times 9x^{9}\\right) \\times$",
"$\\displaystyle 10{x}^{10}$์ด๋ค.",
"๊ทธ๋ฌ๋ฏ๋ก $\\displaystyle (10{x}^{10}+9{x}^{10}+16{x}^{10}+21{x}^{10}+24{x}^{10}+25{x}^{10}+$",
"$24 x^{10}+21x^{10}+16 x^{10}+9 x^{10}+10 x^{10})$",
"$=185 x^{10}$",
"Good!"
] |
|
HW | [
"$x+y=-3$",
"$x y=7$",
"์ ๋ณํ์ ์์ฃผ ์ํ์ด์!",
"$x^{2}-x y+y^{2}=(x+y)^{2}-3 x y$",
"$9-21=-12$",
"$-12$"
] |
|
HW | [
"$(11x+3)(3 x-5)$",
"$=33 x^{2}-55 x+9 x-15$",
"$=33 x^{2}-46 x-15$",
"Good!!",
"$33 x^{2}-46 x-15$"
] |
|
HW | [
"$16 x^{2}+40 x+25$",
"ํฐ ํจ๋",
"๊น๋",
"$16 x^{2}+40 x+25$"
] |
|
HW | [
"$9 a^{2}+12 a b-12 a c$",
"$12 a b+16 b^{2}-16 b c$",
"$12 a c+16 b c-16 c^{2}$",
"$=9 a^{2}+16 b^{2}-16 c^{2}+24 a b$",
"์ข์์!",
"์ข์ ํ์ด์ฌ์."
] |
|
HW | [
"$\\displaystyle x$์ฐจ์: $\\displaystyle 1$ ์์ $\\displaystyle k$",
"$(2 x^{2}-x+2)(x^2-4x+k)= \\cdots -kx-8x,\\quad -k-8=5,\\quad k =-13$",
"good!",
"$\\therefore k=-13$",
"$k=-13$"
] |
|
HW | [
"$\\displaystyle x$์ ๋ํ ํญ๋ฑ์์ด๋ฏ๋ก",
"$a=5, b=-2, c=-3 .$",
"$a+b+c=0 .$",
"$0$"
] |
|
HW | [
"$\\displaystyle P(x)=(x-6)Q(x)+1$ ์ด๋ฏ๋ก",
"$(x+4) P(x)=(x-6)(x+4) Q(x)+x+4$",
"$=(x-6)(x+4) Q(x)+x-6+10$",
"$=(x-6)\\{(x+4) Q(x)+1\\}+10$",
"์ด๋ค. ๋ฐ๋ผ์ ๋๋จธ์ง๋ $10$์ด๋ค."
] |
|
HW | [
"$\\displaystyle x$์ ๋ํ ํญ๋ฑ์์ด๋ฏ๋ก",
"$a=4, b=-4, \\quad c=-1 .$",
"$a+b+c=-1$",
"$-1$"
] |
|
HW | [
"$(x-1)^{54}=x Q(x)+R$",
"$\\displaystyle x=0$์ ๋์
ํ๋ฉด, $\\displaystyle R=1$.",
"$\\displaystyle x= \\; 472$๋ฅผ ๋์
ํ๋ฉด,",
"$471^{54}=472 Q(472)+1 .$",
"$\\displaystyle \\therefore {471}^{54}$๋ฅผ $\\displaystyle 472$๋ก ๋๋์์ ๋์",
"๋๋จธ์ง๋ $\\displaystyle 1$.",
"$1 .$"
] |
|
HW | [
"$P(x)=(x+3) Q(x)+4$",
"$Q(x)=(x-2) Q^{\\prime}(x)+5$",
"$P(2)=5 \\times Q(2)+4$",
"$Q(2)=5$",
"$P(2)=25+4=29$",
"29"
] |
|
HW | [
"$ k$์ ๊ด๊ณ์์ด $ x=1$ ์ด๋ฏ๋ก ,",
"1) $k=5$์ผ ๋ $x^{2}+9_{m+n}+4=0 \\to 9_{m+n} = -5$",
"2) $\\displaystyle k = -4$ ์ผ๋ $\\displaystyle {x}^{2}-9x + n +4 = 0 \\to n =4$",
"$\\displaystyle \\therefore 9m=-9 \\to m=-1$์ด๋ฏ๋ก $\\displaystyle mn=-4$์ด๋ค.",
"$-4$"
] |