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Expansion of (x^2 - y^2)

Factorise: x...

Question

Factorise:
$x^{2} + 5 x - 104$

A

(x - 13) (x - 8)

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B

(x + 13) (x - 8)

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C

(13 x + 3) (x - 8)

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D

(20 x + 3) (x - 8)

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Solution

The correct option is B $(x + 13) (x - 8)$
$x^{2} + 5 x - 104$
$= x^{2} + 13 x - 8 x - 104$
$= x (x + 13) - 8 (x + 13)$
$= (x - 8) (x + 13)$

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