Evaluate
\left(2a+b\right)^{2}+b-2a
Expand
4a^{2}+4ab-2a+b^{2}+b
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4a^{2}+4ab+b^{2}-\left(2a-b\right)
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}-2a+b
To find the opposite of 2a-b, find the opposite of each term.
4a^{2}+4ab+b^{2}-\left(2a-b\right)
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}-2a+b
To find the opposite of 2a-b, find the opposite of each term.
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