Final answer to the problem
$4-y$
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1
Apply the formula: $\left(a+b\right)\left(a+c\right)$$=a^2-b^2$, where $a=2$, $b=\sqrt{y}$, $c=-\sqrt{y}$, $a+c=2-\sqrt{y}$ and $a+b=2+\sqrt{y}$
$4-y$
Final answer to the problem
$4-y$
