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49n^{2}-112n+64-n^{2}
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(7n-8\right)^{2}.
48n^{2}-112n+64
Combine 49n^{2} and -n^{2} to get 48n^{2}.
49n^{2}-112n+64-n^{2}
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(7n-8\right)^{2}.
48n^{2}-112n+64
Combine 49n^{2} and -n^{2} to get 48n^{2}.