Y^2+7y 144=y^2+16y 9y 144 ∵ 144= 16× 9 amp; 7=16 9 amp; =y(y+16) 9(y+16) =(y+16)(y 9) 𝐀𝐧𝐬. ...

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Factorisation by Regrouping Terms

Factorise: y2...

Question

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

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Solution

$y^{2} + 7 y - 144 = y^{2} + 16 y - 9 y - 144 {\begin{matrix} ∵ 144 = - 16 \times 9 7 = 16 - 9 \end{matrix}} = y (y + 16) - 9 (y + 16) = (y + 16) (y - 9) A n s .$

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