Expand
81b^{2}+72b+16
Evaluate
\left(9b+4\right)^{2}
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81b^{2}+72b+16
Use binomial theorem \left(p+q\right)^{2}=p^{2}+2pq+q^{2} to expand \left(9b+4\right)^{2}.
81b^{2}+72b+16
Use binomial theorem \left(p+q\right)^{2}=p^{2}+2pq+q^{2} to expand \left(9b+4\right)^{2}.
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