Evaluate : (9a − 7b) (3a − b) - Vidyadip

Question

Evaluate : $(9a − 7b) (3a − b)$

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Answer

$(9a − 7b) (3a − b)$
$= 9a (3a − b) − 7b (3a − b)$
$= 27a^2 − 9ab − 21ab + 7b^2$
$= 27a^2 − 30ab + 7b^2$

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