Factorise

$(i) c - 5 + 5 a b - a b c$

$(i i) 15 x y - 6 x + 5 y - 2$ [3 MARKS]

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Solution

Application: 1.5 Marks each

$(i) c - 5 + 5 a b - a b c$

$= c - 5 - a b (c - 5)$

$= (c - 5) (1 - a b)$

$(i i) 15 x y - 6 x + 5 y - 2$

$= 3 \times 5 \times x \times y - 3 \times 2 \times x + 5 \times y - 2$

$= 3 x (5 y - 2) + 1 (5 y - 2)$

$= (5 y - 2) (3 x + 1)$

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