Use suitable identities to find the following products:
$(3 - 2 x) (3 + 2 x)$

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Solution

$(3 - 2 x) (3 + 2 x)$

This is in the form of $(a + b) (a - b)_{=} a^{2} - b^{2}$

$\Rightarrow (3 - 2 x) (3 + 2 x) = 3^{2} - (2 x)^{2}$

$\Rightarrow (3 - 2 x) (3 + 2 x) = 9 - 4 x^{2}$

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