Evaluate
12\left(n-1\right)\left(2n-3\right)
Expand
24n^{2}-60n+36
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25n^{2}-60n+36-n^{2}
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(5n-6\right)^{2}.
24n^{2}-60n+36
Combine 25n^{2} and -n^{2} to get 24n^{2}.
25n^{2}-60n+36-n^{2}
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(5n-6\right)^{2}.
24n^{2}-60n+36
Combine 25n^{2} and -n^{2} to get 24n^{2}.
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