Evaluate
\frac{4\left(m-9n\right)^{2}}{9}
Expand
-8mn+\frac{4m^{2}}{9}+36n^{2}
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\frac{4}{9}m^{2}-8mn+36n^{2}
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(\frac{2}{3}m-6n\right)^{2}.
\frac{4}{9}m^{2}-8mn+36n^{2}
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(\frac{2}{3}m-6n\right)^{2}.
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