Evaluate
\frac{\left(2x-1\right)^{2}}{4}+a
Expand
x^{2}-x+a+\frac{1}{4}
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x^{2}-x+\frac{1}{4}+a
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(x-\frac{1}{2}\right)^{2}.
x^{2}-x+\frac{1}{4}+a
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(x-\frac{1}{2}\right)^{2}.
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