Expand
25m^{2}-20mn+4n^{2}
Evaluate
\left(2n-5m\right)^{2}
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4n^{2}-20nm+25m^{2}
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(2n-5m\right)^{2}.
4n^{2}-20nm+25m^{2}
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(2n-5m\right)^{2}.
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