Multiply: 12a + 5b by 7a − b - Vidyadip

Question

Multiply: $12a + 5b$ by $7a − b$

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Answer

$(12a + 5b) (7a − b) = 12a (7a − b) + 5b (7a − b)$
$= 84a^2 − 12ab + 35ab − 5b^2$
$= 84a^2 + 23ab − 5b^2$

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