Multiply: (x - a)(x + 3b) - Vidyadip

Question

Multiply: $(x - a)(x + 3b)$

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Answer

$(x - a)(x + 3b)$
$\Rightarrow x (x + 3b) - a (x + 3b)$
$\Rightarrow x^2 + 3bx - ax - 3ab$

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