Factorise: x²- 23y +120
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p(x) = x² - 23x + 120
= x² - 23x + 120
= x² - (12 + 10)x + 120
= x² - 12x - 10x + 120
= x(x - 12) - 10(x - 12)
= (x - 12) (x - 10)
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