Evaluate
\frac{\left(4z-9\right)^{2}}{16}
Expand
z^{2}-\frac{9z}{2}+\frac{81}{16}
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z^{2}-\frac{9}{2}z+\frac{81}{16}
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(z-\frac{9}{4}\right)^{2}.
z^{2}-\frac{9}{2}z+\frac{81}{16}
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(z-\frac{9}{4}\right)^{2}.
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