Use a quadratic equation to find two numbers with a sum of 15 and a product of 63

Answer 1

x+y=15

xy=63

x=63/y

63/y + y = 15

63 + y^2 = 15y

y^2 -15y +63 = 0

(y-9)(y-7) = 0

y=7 or 9

x= 9 or 7

solution is (7,9) or (9,7)

9 times 7 = 3

and 9+7= 16