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a\left(4a^{2}-49\right)
Factor out a.
\left(2a-7\right)\left(2a+7\right)
Consider 4a^{2}-49. Rewrite 4a^{2}-49 as \left(2a\right)^{2}-7^{2}. The difference of squares can be factored using the rule: p^{2}-q^{2}=\left(p-q\right)\left(p+q\right).
a\left(2a-7\right)\left(2a+7\right)
Rewrite the complete factored expression.