Evaluate
\frac{9\left(5-a\right)^{2}}{16}
Expand
\frac{9a^{2}}{16}-\frac{45a}{8}+\frac{225}{16}
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\frac{9}{16}a^{2}-\frac{45}{8}a+\frac{225}{16}
Use binomial theorem \left(p+q\right)^{2}=p^{2}+2pq+q^{2} to expand \left(-\frac{3}{4}a+\frac{15}{4}\right)^{2}.
\frac{9}{16}a^{2}-\frac{45}{8}a+\frac{225}{16}
Use binomial theorem \left(p+q\right)^{2}=p^{2}+2pq+q^{2} to expand \left(-\frac{3}{4}a+\frac{15}{4}\right)^{2}.
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