Find the product:
$4 a (3 a + 7 b)$

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Solution

Given $4 a (3 a + 7 b)$
$= 4 a \times 3 a + 4 a \times 7 b$
$= (4 \times 3) (a \times a) + 4 \times (7 a) \times b$
$= 12 a^{2} + 28 a b$
$∴ 4 a (3 a + 7 b) = 12 a^{2} + 28 a b$

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