Expand
n^{2}-4n+1
Evaluate
\left(n-2\right)^{2}-3
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n^{2}-4n+4-3
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(n-2\right)^{2}.
n^{2}-4n+1
Subtract 3 from 4 to get 1.
n^{2}-4n+4-3
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(n-2\right)^{2}.
n^{2}-4n+1
Subtract 3 from 4 to get 1.
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