Evaluate
\left(n-1\right)\left(n+7\right)
Expand
n^{2}+6n-7
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n^{2}+6n+9-16
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(n+3\right)^{2}.
n^{2}+6n-7
Subtract 16 from 9 to get -7.
n^{2}+6n+9-16
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(n+3\right)^{2}.
n^{2}+6n-7
Subtract 16 from 9 to get -7.
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