Factor y^2-4

$y^{2} - 4$

Rewrite $4$ as $2^{2}$ .

$y^{2} - 2^{2}$

Since both terms are perfect squares, factor using the difference of squares formula, $a^{2} - b^{2} = (a + b) (a - b)$ where $a = y$ and $b = 2$ .

$(y + 2) (y - 2)$

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