Factorise: y^2+y-72 - Vidyadip

Question

Factorise: $y^2+y-72$

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Answer

$y^2+y-72$
$=y^2+9 y-8 y-72$
$\{-72=9 \times(-8), 1=9-8\}$
$= y(y + 9) - 8(y + 9) $
$= (y + 9)(y - 8)$

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