Question 3(i)
Factorise
$x^{2} + x y + 8 x + 8 y$

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Solution

$x^{2} + x y + 8 x + 8 y = x \times x + x \times y + 8 \times x + 8 \times y = x (x + y) + 8 (x + y) = (x + y) (x + 8)$

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