Question

What is x2+2x-8=0 by factoring ?

Answer 1

(x+4)(x-2)

Explanation:

We need to find two numbers that multiply to -8 and add up to 2. These are 4,-2.

Rewrite the polynomial:

x^2-2x+4x-8

and factor each pair:

x(x-2)+4(x-2) = (x+4)(x-2)