Factor
\frac{\left(6a-b\right)\left(6a+b\right)}{9}
Evaluate
-\frac{b^{2}}{9}+4a^{2}
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\frac{36a^{2}-b^{2}}{9}
Factor out \frac{1}{9}.
\left(6a-b\right)\left(6a+b\right)
Consider 36a^{2}-b^{2}. Rewrite 36a^{2}-b^{2} as \left(6a\right)^{2}-b^{2}. The difference of squares can be factored using the rule: p^{2}-q^{2}=\left(p-q\right)\left(p+q\right).
\frac{\left(6a-b\right)\left(6a+b\right)}{9}
Rewrite the complete factored expression.
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