Question
Factorise:
x2 - (a + b)x + ab
x2 - (a + b)x + ab
✓
Answer
x2 - (a + b)x + ab
= x2 - ax - bx + ab
= x(x - a) - b(x - a)
= (x - a)(x - b)
= x2 - ax - bx + ab
= x(x - a) - b(x - a)
= (x - a)(x - b)
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