Express 13x−6x2(2x−3)\frac{13x - 6}{x^2(2x - 3)} in partial fractions. Hence ∫13x−6x2(2x−3) dx\int \frac{13x - 6}{x^2(2x - 3)} \, dx.

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Worked solution

6(b)

1. Substitute the partial fractions obtained in part (a)

From part (a), we have:
13x−6x2(2x−3)=−3x+2x2+62x−3\frac{13x - 6}{x^2(2x - 3)} = -\frac{3}{x} + \frac{2}{x^2} + \frac{6}{2x - 3}

∫13x−6x2(2x−3) dx=∫(−3x+2x−2+62x−3) dx\int \frac{13x - 6}{x^2(2x - 3)} \, dx = \int \left( -\frac{3}{x} + 2x^{-2} + \frac{6}{2x - 3} \right) \, dx

2. Integrate each term with respect to $x$

=−3ln⁡x+2x−1−1+6ln⁡(2x−3)2+c= -3 \ln x + \frac{2x^{-1}}{-1} + \frac{6 \ln(2x - 3)}{2} + c
=−3ln⁡x−2x+3ln⁡(2x−3)+c= -3 \ln x - \frac{2}{x} + 3 \ln(2x - 3) + c

Answer

−3ln⁡x−2x+3ln⁡(2x−3)+c-3 \ln x - \frac{2}{x} + 3 \ln(2x - 3) + c

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