Evaluate
-\frac{4a^{3}}{27}-\frac{40a}{3}+32
Factor
\frac{4\left(216-90a-a^{3}\right)}{27}
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-\frac{4}{27}a^{3}-\frac{40}{3}a+32
Combine \frac{8}{3}a and -16a to get -\frac{40}{3}a.
\frac{4\left(-a^{3}+18a-108a+216\right)}{27}
Factor out \frac{4}{27}. Polynomial -a^{3}-90a+216 is not factored since it does not have any rational roots.
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