Question 3(ii)
Factorise
$15 x y - 6 x + 5 y - 2$

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Solution

$15 x y - 6 x + 5 y - 2 = 3 \times 5 \times x \times y - 3 \times 2 \times x + 5 y - 2 = 3 x (5 y - 2) + 1 (5 y - 2) = (5 y - 2) (3 x + 1)$

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