Question
Factorise:
$x^2-x(a+2 b)+12 a b$
$x^2-x(a+2 b)+12 a b$
✓
Answer
$x ^2- x ( a +2 b)+2 ab$
$=x^2-x a-2 b x+2 a b$
$=x(x-a)-2 b x+2 a b$
$=x(x-a)-2 b(x-a)$
$=(x-a)(x-2 b)$
$=x^2-x a-2 b x+2 a b$
$=x(x-a)-2 b x+2 a b$
$=x(x-a)-2 b(x-a)$
$=(x-a)(x-2 b)$
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