Question 91 (i)

Factorise the following:

$x^{2} + 15 x + 26$

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Solution

We have, $x^{2} + 15 x + 26$
$= x^{2} + 2 x + 13 x + 2 \times 13 = x (x + 2) + 13 (x + 2) = (x + 2) (x + 13)$

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Question 92 (i)

Factorise the following using the identity $a^{2} - b^{2} = (a + b) (a - b) .$

$x^{2} - 9$

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