Multiply : $(a + 3 b)$ and $(x + 5)$

a x + 5 a + 3 b x + 15 b

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a - 5 a x + 3 b x + 15 b

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a x - 5 a + 3 b + 15 b x

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a + 5 x + 3 b x + 15 b

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Solution

The correct option is B $a x + 5 a + 3 b x + 15 b$
$(a + 3 b) \times (x + 5)$
$= a (x + 5) + 3 b (x + 5)$
$= a x + 5 a + 3 b x + 15 b$

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