Factor the expression 10x2 + 20x - 80

10x^2 + 20x - 80 take out the greatest common factor, 10

10 (x^2 + 2x - 8)

To factor the polynomial, we need two numbers that add to 2 and multiply to -8.....

4 and -2 seem to be just right....so we have

10 ( x + 4) ( x - 2)

I'm a bit confused, would I expand the two polynomials then multiply the answer all by 10?

Nevermind, I understand now