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