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