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