Simplify: $(2 x - 3 y) (2 x + 3 y)$

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Solution

We know that, $(a + b) (a - b) = a^{2} - b^{2}$ .
$∴ (2 x - 3 y) (2 x + 3 y) = 4 x^{2} - 9 y^{2}$

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