Factorise:
$x^{2} - 6 x - 135$

(5 x) (13 x + 9)

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(x - 15) (13 x + 9)

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(5 x) (x + 9)

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(x - 15) (x + 9)

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Solution

The correct option is C $(x - 15) (x + 9)$
$x^{2} - 6 x - 135$
$x^{2} - 15 x + 9 x - 135$
$x (x - 15) + 9 (x - 15)$
$= (x - 15) (x + 9)$

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