Factorise:
$x^{2} - 11 x - 42$

(x - + 4) (x + 3)

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(x + 2) (x + 3)

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(x - 14) (x + 3)

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(x - 2) (x + 3)

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Solution

The correct option is C $(x - 14) (x + 3)$
$x^{2} - 11 x - 42$
$= x^{2} - 14 x + 3 x - 42$
$= x (x - 14) + 3 (x - 14)$
$= (x - 14) (x + 3)$

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