Evaluate
\frac{\left(a-2b+4\right)^{2}}{16}
Expand
-\frac{ab}{4}+\frac{a^{2}}{16}+\frac{b^{2}}{4}+\frac{a}{2}-b+1
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\frac{1}{16}a^{2}-\frac{1}{4}ab+\frac{1}{2}a+\frac{1}{4}b^{2}-b+1
Square \frac{1}{4}a-\frac{1}{2}b+1.
\frac{1}{16}a^{2}-\frac{1}{4}ab+\frac{1}{2}a+\frac{1}{4}b^{2}-b+1
Square \frac{1}{4}a-\frac{1}{2}b+1.
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