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Linear Equation in One Variable

Factorise: x2...

Question

Factorise:
$x^{2} - (a + b) x + a b$

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Solution

x²– (a + b) x + ab

x²– (a + b) x + ab

= x² – ax – bx + ab

= x (x – a) – b(x – a)

= (x – a) (x – b)

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