Evaluate
\left(21a^{3}-5\right)a^{4}
Factor
\left(21a^{3}-5\right)a^{4}
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7a^{7}+6a^{4}+14a^{7}-11a^{4}
Combine 14a^{7} and -7a^{7} to get 7a^{7}.
21a^{7}+6a^{4}-11a^{4}
Combine 7a^{7} and 14a^{7} to get 21a^{7}.
21a^{7}-5a^{4}
Combine 6a^{4} and -11a^{4} to get -5a^{4}.
a^{4}\left(21a^{3}-5\right)
Factor out a^{4}. Polynomial 21a^{3}-5 is not factored since it does not have any rational roots.
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