Evaluate
4b\left(a+b\right)
Expand
4ab+4b^{2}
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a^{2}+4ab+4b^{2}-a^{2}
Use binomial theorem \left(p+q\right)^{2}=p^{2}+2pq+q^{2} to expand \left(a+2b\right)^{2}.
4ab+4b^{2}
Combine a^{2} and -a^{2} to get 0.
a^{2}+4ab+4b^{2}-a^{2}
Use binomial theorem \left(p+q\right)^{2}=p^{2}+2pq+q^{2} to expand \left(a+2b\right)^{2}.
4ab+4b^{2}
Combine a^{2} and -a^{2} to get 0.
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