Factor completely: $4 a^{2} b + 12 a b - 72 a b$

4 b (a^{2} - 15)

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4 b a (a - 15)

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4 b (a - 15) (a + 6)

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4 b (a - 15 a)

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Solution

The correct option is A $4 b a (a - 15)$
The value of $4 a^{2} b + 12 a b - 72 a b$
$= 4 a^{2} b - 60 a b$
$= 4 b (a^{2} - 15 a)$
$= 4 b a (a - 15)$

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