Evaluate
\left(4-a\right)^{2}+4
Expand
a^{2}-8a+20
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4+16-8a+a^{2}
Use binomial theorem \left(p-q\right)^{2}=p^{2}-2pq+q^{2} to expand \left(4-a\right)^{2}.
20-8a+a^{2}
Add 4 and 16 to get 20.
4+16-8a+a^{2}
Use binomial theorem \left(p-q\right)^{2}=p^{2}-2pq+q^{2} to expand \left(4-a\right)^{2}.
20-8a+a^{2}
Add 4 and 16 to get 20.
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