Evaluate
m\left(m-6\right)
Expand
m^{2}-6m
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m^{2}-6m+9-9
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(m-3\right)^{2}.
m^{2}-6m
Subtract 9 from 9 to get 0.
m^{2}-6m+9-9
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(m-3\right)^{2}.
m^{2}-6m
Subtract 9 from 9 to get 0.
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