Question

If (x + 5)(x - 2) = 18, then which of the following statements is true?



A. x + 7 = 0 or x - 4 = 0

B. x + 5 = 0 or x - 2 = 0

C. x + 5 = 6 or x - 2 = 3

Answer 1

distribute out the parenthesis first

Answer 2

x^2 -2x + 5x -10 = 18

x^2 + 3x - 28 = 0

Answer 3

now factor that into (x ) ( x ) = 0

Answer 4

7*4 = 28, so already can tell the first answer is it

Answer 5

(x +7)*(x - 4) = x^2 + 3x - 28 = 0

so

(x+7) = 0
or
(x-4) = 0

Answer 6

Thank you for explaining. :)

Answer 7

welcome, anytime