Question

Factories the following: 12ab + 15ab , 9bd - 12 b.
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Answer 1

$1. \: 12ab + 15ab \\ = 27ab \\ this \: is \: the \: final \: answer$

$2. \: 9bd - 12b \\ these \: have \: 3b \: as \: their \: common \: factor \\ answer = 3b(3d - 4)$