The factors of $63 x^{2} - 448$ is

9 (7 x + 8) (7 x - 8)

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7 (3 x + 8)^{2}

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7 (3 x + 8) (3 x - 8)

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9 (7 x - 8)^{2}

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Solution

The correct option is C $7 (3 x + 8) (3 x - 8)$
$A] 63 x^{2} - 448$
$= 7 (9 x^{2} - 64)$
$= 7 ((3 x)^{2} - 8^{2})$
$= 7 (3 x - 8) (3 x + 8)$

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