Question 91 (x)

Factorise the following:

$x^{2} + 4 x - 77$

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Solution

We have, $x^{2} + 4 x - 77$
$x^{2} + (11 - 7) x - 77 = x^{2} + 11 x - 7 x - 77 = x (x + 11) - 7 (x + 11) = (x + 11) (x - 7)$

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