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