the sum of the squares of three numbers is 125 , while the sum of their products taken two at a time is 50 . their sum is :
"x ^ + y ^ 2 + z ^ 2 = 125 xy + yz + zx = 50 as we know . . ( x + y + z ) ^ 2 = x ^ 2 + y ^ 2 + z ^ 2 + 2 ( xy + yz + zx ) so ( x + y + z ) ^ 2 = 125 + ( 2 * 50 ) ( x + y + z ) ^ 2 = 225 so x + y + z = 15 answer : a"
add(multiply(sqrt(divide(subtract(125, 50), const_2)), const_100), sqrt(subtract(125, divide(subtract(125, 50), const_2))))