Question

Resolve into factors.
$13 {a}^{2} - 169$

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Answer 1

$\\ \\ 13 {a}^{2} - 169 \qquad \ \\ \\ = 13( {a}^{2} - 13) \qquad \quad \\ \\ = 13[ {(a)}^{2} - {(13)}^{2} ] \quad \: \\ \\ = 13(a - 13)(a + 13)$