Multiply: (xy + 2b)(xy - 2b) - Vidyadip

Question

Multiply:$ (xy + 2b)(xy - 2b)$

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Answer

$(xy + 2b)(xy - 2b)$
$\Rightarrow xy (xy - 2b) + 2b (xy - 2b)$
$\Rightarrow x^2y^2 - 2bxy + 2bxy - 4b^2$
$\Rightarrow x^2y^2 - 4b^2$

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