Evaluate
a\left(a+2b+1\right)
Expand
a^{2}+2ab+a
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a^{2}+2ab+b^{2}+a-b^{2}
Use binomial theorem \left(p+q\right)^{2}=p^{2}+2pq+q^{2} to expand \left(a+b\right)^{2}.
a^{2}+2ab+a
Combine b^{2} and -b^{2} to get 0.
a^{2}+2ab+b^{2}+a-b^{2}
Use binomial theorem \left(p+q\right)^{2}=p^{2}+2pq+q^{2} to expand \left(a+b\right)^{2}.
a^{2}+2ab+a
Combine b^{2} and -b^{2} to get 0.
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