Evaluate
\frac{\left(2x+1\right)^{2}}{4}-c
Expand
x^{2}+x-c+\frac{1}{4}
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x^{2}+x+\frac{1}{4}-c
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}-c
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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