Evaluate
\left(\frac{9a+1}{10}\right)^{2}
Expand
\frac{81a^{2}}{100}+\frac{9a}{50}+0.01
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0.81a^{2}+0.18a+0.01
Use binomial theorem \left(p-q\right)^{2}=p^{2}-2pq+q^{2} to expand \left(-0.9a-0.1\right)^{2}.
0.81a^{2}+0.18a+0.01
Use binomial theorem \left(p-q\right)^{2}=p^{2}-2pq+q^{2} to expand \left(-0.9a-0.1\right)^{2}.
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