Factorise the following. y^2- 2y - 15 - Vidyadip

Question

Factorise the following.
$y^2- 2y - 15$

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Answer

$y^2- 2y - 15$
$= y^2+ (3 - 5)y - 15$
$= y^2+ 3y - 5y - 15$
$= y(y + 3) - 5(y + 3)$
$= (y + 3)(y - 5)$

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