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Question

The HCF h(y)=2y(y+2) and the LCM m(y)=24y(y+2)2(y2) for two polynomials p(y) and q(y) is known. If p(y)=8y3+32y2+32y and if h(y)m(y)=p(y)q(y), find q(y).

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Solution

HCF h(y)=2y(y+2) and LCM m(y)=24y(y+2)2(y2) for p(y) and q(y)
Now, p(y)=8y3+32y2+32y
=8y(y2+4y+4)
=8y(y2+2y+2y+4)
=8y[y(y+2)+2(y+2)]
=8y(y+2)2
Also, h(y)m(y)=p(y)q(y)
2y(y+2)24y(y+2)2(y2)=8y(y+2)2q(y)
6y(y+2)(y2)=q(y)
q(y)=6y(y222)

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