Question

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

Answer 1

(x+1)(x-3)=5
=>x^2-3x+x-3=5
=>x^2-2x-3=5
=>x^2-2x-8=0
x^2-4x+2x-8=0
=>x(x-4)+2(x-4)=0
=>(x-4)(x+2)=0
x=4,-2