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Question

Factorize each of the following algebraic expression:
y2 + 5y − 36

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Solution

To factorise y2+5y-36, we will find two numbers p and q such that p+q=5 and pq=-36.Now, 9+(-4)=5 and 9×(-4)=-36Splitting the middle term 5y in the given quadratic as -4y+9y, we get: y2+5y-36=y2-4y+9y-36 =(y2-4y)+(9y-36) =y(y-4)+9(y-4) =(y+9)(y-4)

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