Use suitable identities to find the product $(3 x + 2) (3 x - 2)$ of

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Solution

We need to expand $(3 x + 2) (3 x - 2)$
We know suitable identity $(x + y) (x - y) = x^{2} - y^{2}$
So, $(3 x + 2) (3 x - 2)$
$= (3 x)^{2} - (2)^{2}$
$= 9 x^{2} - 4$

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