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The factors of $25 a^{2} - 49 b^{2}$ are

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(5 a - 7 b) a n d (7 a + 5 b)

(5 a - 7 b) a n d (7 a - 5 d)

(5a + 7b) and (5a - 7b)

(7a-5b) and (5a + 7b)

answer is C.

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Detailed Solution

25 a^{2} - 49 b^{2}

$= {(5 a)}^{2} - {(7 b)}^{2}$

$= (5 a + 7 b) (5 a - 7 b)$

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