SOLUTION: {{{-4a^3 - 12a^2 + 72a}}} Factor completely. I am stuck....this one is giving me problems....i don't know what I am doing wrong but my answer is not right according to my tea

Question 251212:
Factor completely.
I am stuck....this one is giving me problems....i don't know what I am doing wrong but my answer is not right according to my teacher. Please help.
Answer by ankor@dixie-net.com(22740) (Show Source): You can put this solution on YOUR website!

Factor completely.
:
We want the coefficient of a^2 to positive 1 so factor out -4a, Change all the signs
-4a(a^2 + 3a - 18)
:
We have a quadratic equation that will factor so we have:
-4a(a + 6)(a - 3)

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