Evaluate
4\left(n+1\right)
Expand
4n+4
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n^{2}+4n+4-n^{2}
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(n+2\right)^{2}.
4n+4
Combine n^{2} and -n^{2} to get 0.
n^{2}+4n+4-n^{2}
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(n+2\right)^{2}.
4n+4
Combine n^{2} and -n^{2} to get 0.
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