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