Factor
9\left(4-3a^{4}\right)
Evaluate
36-27a^{4}
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-27a^{4}+36
Multiply and combine like terms.
9\left(-3a^{4}+4\right)
Factor out 9. Polynomial -3a^{4}+4 is not factored since it does not have any rational roots.
-27a^{4}+36
Combine -28a^{4} and a^{4} to get -27a^{4}.
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