Factorize by finding common factors :

$7 a b + 21 a^{2} + b$

7 a (2 b + 3 a) + b

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21 a (b + 3 a) + b

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7 a (b + 3 a) + a

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7 a (b + 3 a) + b

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Solution

The correct option is D $7 a (b + 3 a) + b$
Given : $7 a b + 21 a^{2} + b$

Take $7 a$ as common from $7 a b + 21 a^{2}$

$\Rightarrow 7 a (b + 3 a) + b$

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