Factor the expression - 8x2z - 16x3. Check your answer.
We could write this expression as 8x2(- z - 2x). However, it is kind of messy to have negative signs in front of every term in the parentheses, and we at Shmoop are a bunch of neat freaks. Let's pull the negative sign (factor of - 1) out: - 8x2(z + 2x). To check the answer, we multiply out: - 8x2(z + 2x) = - 8x2z - 16x3. Awesome. That's totally what we were hoping we would get.