Evaluate
4\left(2e-3f\right)^{2}
Expand
36f^{2}-48ef+16e^{2}
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16e^{2}-48ef+36f^{2}
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(4e-6f\right)^{2}.
16e^{2}-48ef+36f^{2}
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(4e-6f\right)^{2}.
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