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n^{2}-2nk+k^{2}-4n\left(2k-3n\right)
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(n-k\right)^{2}.
n^{2}-2nk+k^{2}-8nk+12n^{2}
Use the distributive property to multiply -4n by 2k-3n.
n^{2}-10nk+k^{2}+12n^{2}
Combine -2nk and -8nk to get -10nk.
13n^{2}-10nk+k^{2}
Combine n^{2} and 12n^{2} to get 13n^{2}.
n^{2}-2nk+k^{2}-4n\left(2k-3n\right)
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(n-k\right)^{2}.
n^{2}-2nk+k^{2}-8nk+12n^{2}
Use the distributive property to multiply -4n by 2k-3n.
n^{2}-10nk+k^{2}+12n^{2}
Combine -2nk and -8nk to get -10nk.
13n^{2}-10nk+k^{2}
Combine n^{2} and 12n^{2} to get 13n^{2}.