Evaluate
\frac{9\left(2m+5n\right)^{2}}{25}
Expand
\frac{36mn}{5}+\frac{36m^{2}}{25}+9n^{2}
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\frac{36}{25}m^{2}+\frac{36}{5}mn+9n^{2}
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(-\frac{6}{5}m-3n\right)^{2}.
\frac{36}{25}m^{2}+\frac{36}{5}mn+9n^{2}
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(-\frac{6}{5}m-3n\right)^{2}.
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