Question 2(vi)
Factorise
$9 x^{2} y^{2} - 16$

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Solution

$9 x^{2} y^{2} - 16 = (3 x y)^{2} - (4)^{2} = (3 x y - 4) (3 x y + 4) [a^{2} - b^{2} = (a - b) (a + b)]$

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Find the factors of the following expression:

$9 x^{2} y^{2} - 16$

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