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