Evaluate
\left(7m-3n\right)^{2}
Expand
49m^{2}-42mn+9n^{2}
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49m^{2}-42mn+9n^{2}
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(7m-3n\right)^{2}.
49m^{2}-42mn+9n^{2}
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(7m-3n\right)^{2}.
Examples
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