Evaluate
\frac{\left(4a-3b\right)^{2}}{36}
Expand
-\frac{2ab}{3}+\frac{4a^{2}}{9}+\frac{b^{2}}{4}
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\frac{4}{9}a^{2}-\frac{2}{3}ab+\frac{1}{4}b^{2}
Use binomial theorem \left(p-q\right)^{2}=p^{2}-2pq+q^{2} to expand \left(\frac{2}{3}a-\frac{1}{2}b\right)^{2}.
\frac{4}{9}a^{2}-\frac{2}{3}ab+\frac{1}{4}b^{2}
Use binomial theorem \left(p-q\right)^{2}=p^{2}-2pq+q^{2} to expand \left(\frac{2}{3}a-\frac{1}{2}b\right)^{2}.
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