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Question

(3x+2)dx(x+1)2(x+2)

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Solution

We have,
I=3x+2(x+1)2(x+2)dx

Let
3x+2(x+1)2(x+2)=Ax+1+B(x+1)2+Cx+2

3x+2=A(x+1)(x+2)+B(x+2)+C(x+1)2

3x+2=A(x2+3x+2)+B(x+2)+C(x2+2x+1) ........(1)

On solving equation (1), we get
A=4,B=1,C=4

Therefore,
I=4x+1dx1(x+1)2dx4x+2dx

I=4ln(x+1)+1x+14ln(x+2)+C

Hence, this is the answer.

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