Question

What is the factored form of 3x^2 + 21x – 24?
3(x + 8)(x – 1)
3(x + 6)(x – 3)
3(x + 5)(x – 3)
3(x + 7)(x – 3)

Answer 1

first one is the answer -

Answer 2

Start by factoring out a 3

3(x^2+7x-8)

Then factor the stuff in the parentheses.
3 (x+8)(x-1)