Factorize $3 a^{2} - 9 a b$ by taking common factors.

3 a (a - 3 b)

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3 a (a - b)

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3 a (3 a - b)

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3 a (a + b)

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Solution

The correct option is C $3 a (a - 3 b)$
$3 a^{2} - 9 a b$
$3$ and $a$ are common in the above two terms in the addition, so taking these as common.
$3 a^{2} - 9 a b = 3 a (a - 3 b)$
Option A is correct.

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