Evaluate
\left(2a+b\right)^{2}
Expand
4a^{2}+4ab+b^{2}
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4a^{2}-4ab+b^{2}+8ab
Use binomial theorem \left(p-q\right)^{2}=p^{2}-2pq+q^{2} to expand \left(2a-b\right)^{2}.
4a^{2}+4ab+b^{2}
Combine -4ab and 8ab to get 4ab.
4a^{2}-4ab+b^{2}+8ab
Use binomial theorem \left(p-q\right)^{2}=p^{2}-2pq+q^{2} to expand \left(2a-b\right)^{2}.
4a^{2}+4ab+b^{2}
Combine -4ab and 8ab to get 4ab.
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