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