Question 91 (ix)

Factorise the following:

$x^{2} - 17 x + 60$

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Solution

$x^{2} - (12 + 5) x + 60 = x^{2} - 12 x - 5 x + 60 = x (x - 12) - 5 (x - 12) = (x - 12) (x - 5)$

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