Factorise $x^{2} - x - 72$

(x - 9) (x + 8)

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(x + 9) (x - 8)

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(x - 18) (x + 4)

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(x - 4) (x + 18)

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Solution

The correct option is A $(x - 9) (x + 8)$
$F a c t o r i z i n g x^{2} - x - 72, S p l i t x a s : = x^{2} - 9 x + 8 x - 72 = x (x - 9) + 8 (x - 9) = (x - 9) (x + 8)$

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