Question

If (x + 1)(x - 5) = -9, then which of the following statements is true?
x + 1 = 0 or x - 5 = 0
x + 1 = -9 or x - 5 = -9
x - 2 = 0

Answer 1

im thinking its the second one

Answer 2

(x + 1)(x - 5) = -9


x^2 - 5x + x - 5 = -9


x^2 - 5x + x - 5 + 9 = 0


x^2 - 4x + 4 = 0


(x - 2)(x - 2) = 0


x - 2 = 0 or x - 2 = 0


x - 2 = 0


So it's the last choice

Answer 3

Yeah you can only do a*b=0 implies a=0 or b=0 or both=0

Answer 4

You have to have that product =0

Answer 5

oh i see

Answer 6

thank u