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