In one sentence, describe what the following article is about: A quadratic equation is an equation that takes the form ax2+bx+c=0{\displaystyle ax^{2}+bx+c=0}. A quadratic equation has two solutions, which means a line written in this form is a parabola and will have two x-intercepts. For example, the equation x2+3x10=0{\displaystyle x^{2}+3x-10=0} is a quadratic equation, so this line will have two x-intercepts. The formula is x=bb24ac2a{\displaystyle x={
rac {-b\pm {\sqrt {b^{2}-4ac}}}{2a}}}, where a{\displaystyle a} equals the coefficient of the second-degree term (x2{\displaystyle x^{2}}), b{\displaystyle b} equals the coefficient of the first-degree term (x{\displaystyle x}), and c{\displaystyle c} equals the constant. Make sure you substitute the correct values for each variable from the equation of the line. For example, if the equation of your line is x2+3x10=0{\displaystyle x^{2}+3x-10=0}, your quadratic formula will look like this: x=3324(1)(10)2(1){\displaystyle x={
rac {-3\pm {\sqrt {3^{2}-4(1)(-10)}}}{2(1)}}}. To do this, first complete all of the multiplication. Make sure you pay close attention to all positive and negative signs. For example:x=3324(10)2(1){\displaystyle x={
rac {-3\pm {\sqrt {3^{2}-4(-10)}}}{2(1)}}}x=332+402{\displaystyle x={
rac {-3\pm {\sqrt {3^{2}+40}}}{2}}} Square the b{\displaystyle b} term. Then, add this number to the other number under the square root sign. For example:x=332+402{\displaystyle x={
rac {-3\pm {\sqrt {3^{2}+40}}}{2}}}x=39+402{\displaystyle x={
rac {-3\pm {\sqrt {9+40}}}{2}}}x=3492{\displaystyle x={
rac {-3\pm {\sqrt {49}}}{2}}} Since the quadratic formula has a {\displaystyle \pm }, you will solve once by adding, and once by subtracting. Solving by adding will give you your first x{\displaystyle x} value. For example:x=3+492{\displaystyle x={
rac {-3+{\sqrt {49}}}{2}}}x=3+72{\displaystyle x={
rac {-3+7}{2}}}x=42{\displaystyle x={
rac {4}{2}}}x=2{\displaystyle x=2} This will give you the second value for x{\displaystyle x}. First calculate the square root, then find the difference in the numerator. Finally, divide by 2. For example:x=3492{\displaystyle x={
rac {-3-{\sqrt {49}}}{2}}}x=372{\displaystyle x={
rac {-3-7}{2}}}x=102{\displaystyle x={
rac {-10}{2}}}x=5{\displaystyle x=-5} Remember that an ordered pair gives the x-coordinate first, then the y-coordinate (x,y){\displaystyle (x,y)}. The x{\displaystyle x} values will be the values you calculated using the quadratic formula. The y{\displaystyle y} value will be 0, since at the x-intercept, y{\displaystyle y} always equals 0. For example, for the line x2+3x10=0{\displaystyle x^{2}+3x-10=0}, the x-intercepts are at points (2,0){\displaystyle (2,0)} and (5,0){\displaystyle (-5,0)}.
Summary: Determine that the equation of the line is a quadratic equation. Set up the quadratic formula. Plug all of the values into the quadratic formula. Simplify the equation. Calculate the exponent. Solve for the addition formula. Solve for the subtraction formula. Find the ordered pairs for the x-intercept.

In one sentence, describe what the following article is about: If your cooktop is hot while you're cleaning it, you run the risk of burning yourself during the cleaning process. Additionally, you might cause the cleaning agent you're using to vaporize, causing irritation to the eyes or skin. Don't assume your stainless steel cooktop is cool just because it is off. Hold your hand just barely above the cooktop to detect heat. Alternately, wet your hand and flick a few drops of water at the stainless steel cooktop. If the water sizzles, the cooktop is too hot to clean. Chemical cleaners or formulae containing chlorides (bromine, iodine, chlorine, fluorine, and so on) can damage your stainless steel cooktop. Likewise, cleaning agents containing alcohol, mineral spirits, and ammonia can cause your stainless steel cooktop to corrode. To avoid using these products, carefully read the label on the exterior of any cleaning product before utilizing it. If you're unsure whether a stainless steel cleaning agent might damage your stainless steel cooktop, apply it to a small, relatively hidden portion of the cooktop (the back or sides, for example) and wait a day or two. Examine the stainless steel cooktop. If the area appears damaged or corroded, do not apply the cleaning agent to the rest of the cooktop. Avoid cleaning compounds that contain grit. Do not use steel wool or steel brushes. Both steel wool and steel brushes can scratch your stainless steel cooktop. Instead, use a microfiber cleaning cloth. These cloths are specially designed to wipe away even the most firmly embedded grime or stains.
Summary:
Wait until the cooktop is cool before cleaning. Do not use abrasive compounds. Use a microfiber cloth.