Factorise: y^2+y-72 - Vidyadip

Question

Factorise:
$y^2+y-72$

✓

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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