Question

If (x + 1)(x - 3) = 5, then which of the following statements is true?
x + 1 = 0 or x - 3 = 0
x + 1 = 5 or x - 3 = 5
x - 4 = 0 or x + 2 = 0

Answer 1

expanding you get x^2-2x-3=5
so x^2-2x-8=0
so (x-4)(x+2)=0
then x-4=0 or x+2=0

Answer 2

ok thanks you

Answer 3

no problem