Factor
\left(4b+9\right)\left(16b^{2}-36b+81\right)
Evaluate
64b^{3}+729
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\left(4b+9\right)\left(16b^{2}-36b+81\right)
Rewrite 64b^{3}+729 as \left(4b\right)^{3}+9^{3}. The sum of cubes can be factored using the rule: p^{3}+q^{3}=\left(p+q\right)\left(p^{2}-pq+q^{2}\right). Polynomial 16b^{2}-36b+81 is not factored since it does not have any rational roots.
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