Question

Factorise:
$y^2+7y-144$

• A. $(y+16)(y+8)$
• B. $(y+16)(y-9)$
• C. $(y-16)(y-9)$
• D. $(y+16)(y-8)$

Answer 1

Answer: (B)

$(y+16)(y-9)$

$y^2+7y-144$
$=y^2+16y-9y-144$
$=y(y+16)-9(y+16)$
$=(y+16)(y-9)$