Evaluate
\left(a+1\right)^{2}+b^{2}
Expand
a^{2}+2a+b^{2}+1
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1+2a+a^{2}+b^{2}
Use binomial theorem \left(p+q\right)^{2}=p^{2}+2pq+q^{2} to expand \left(1+a\right)^{2}.
1+2a+a^{2}+b^{2}
Use binomial theorem \left(p+q\right)^{2}=p^{2}+2pq+q^{2} to expand \left(1+a\right)^{2}.
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