Question
Using the identity $\left(a^2-b^2\right)=(a+b)(a-b)$, evaluate :
$\left(7 \frac{3}{4}\right)^2-\left(2 \frac{1}{4}\right)^2$
$\left(7 \frac{3}{4}\right)^2-\left(2 \frac{1}{4}\right)^2$
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