if a certain number is multiplied by 8 less than its self the product is 20. what is the number.

Answer 1

x(x-8) = 20

x^2 - 8x -20 = 0

(x-10)(x+2) = 0

x-10=0 or x+2=0

x =10 or -2

10(10-8) = 10(2) = 20

-2(-2-8) = -2(-10) = 20