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