Question
Factorise: $y^2+7 y-144$
✓
Answer
$y^2+7 y-144$
$=y^2+16 y-9 y-144$
${144 = -16 × 9, 7 = 16 - 9}$
$= y(y + 16) - 9(y + 16) $
$= (y + 16)(y - 9)$
$=y^2+16 y-9 y-144$
${144 = -16 × 9, 7 = 16 - 9}$
$= y(y + 16) - 9(y + 16) $
$= (y + 16)(y - 9)$
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