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r\left(64r^{2}-81\right)
Factor out r.
\left(8r-9\right)\left(8r+9\right)
Consider 64r^{2}-81. Rewrite 64r^{2}-81 as \left(8r\right)^{2}-9^{2}. The difference of squares can be factored using the rule: a^{2}-b^{2}=\left(a-b\right)\left(a+b\right).
r\left(8r-9\right)\left(8r+9\right)
Rewrite the complete factored expression.