Expand
a^{2}+4ab+b^{2}
Evaluate
\left(a+b\right)^{2}+2ab
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a^{2}+2ab+b^{2}+2ab
Use binomial theorem \left(p+q\right)^{2}=p^{2}+2pq+q^{2} to expand \left(a+b\right)^{2}.
a^{2}+4ab+b^{2}
Combine 2ab and 2ab to get 4ab.
a^{2}+2ab+b^{2}+2ab
Use binomial theorem \left(p+q\right)^{2}=p^{2}+2pq+q^{2} to expand \left(a+b\right)^{2}.
a^{2}+4ab+b^{2}
Combine 2ab and 2ab to get 4ab.
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