Question 91 (xi)

Factorise the following:

$y^{2} + 7 y + 12$

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Solution

We have, $y^{2} + 7 y + 12$
$y^{2} + (4 + 3) y + 12 = y^{2} + 4 y + 3 y + 12 = y (y + 4) + 3 (y + 4) = (y + 4) (y + 3)$

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