Question 91 (vi)

Factorise the following:

$y^{2} - 2 y - 15$

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Solution

We have, $y^{2} - 2 y - 15$
$= y^{2} + (3 - 5) y - 15 = y^{2} + 3 y - 5 y - 15 = y (y + 3) - 5 (y + 3) = (y + 3) (y - 5)$

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Question 92 (vi)

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

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