Evaluate
\frac{\left(8x-y\right)^{2}}{16}
Expand
-xy+\frac{y^{2}}{16}+4x^{2}
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4x^{2}-xy+\frac{1}{16}y^{2}
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(2x-\frac{1}{4}y\right)^{2}.
4x^{2}-xy+\frac{1}{16}y^{2}
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(2x-\frac{1}{4}y\right)^{2}.
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