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