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