Solved example of algebra
Multiply the single term $2-\sqrt{y}$ by each term of the polynomial $\left(2+\sqrt{y}\right)$
Multiply the single term $2$ by each term of the polynomial $\left(2-\sqrt{y}\right)$
Multiply the single term $\sqrt{y}$ by each term of the polynomial $\left(2-\sqrt{y}\right)$
Cancel like terms $-2\sqrt{y}$ and $2\sqrt{y}$
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