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Integration by parts

28 practice questionsIntegral CalculusStep-by-step solutions

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1

Given I=∫19xln⁡x dxI = \int_1^{9} \sqrt{x}\ln x\,dx. What is the final simplified expression of ∫xln⁡x dx\int \sqrt{x}\ln x\,dx, before adding the limits?

A.23x32(ln⁡x−23)\frac{2}{3}x^{\frac32}(\ln x - \frac{2}{3})
B.x12(32ln⁡x−94)x^{\frac12}(\frac32\ln x - \frac94)
C.x32(ln⁡x−1)x^{\frac32}(\ln x - 1)
D.32x−12(ln⁡x−23)\frac32 x^{-\frac12}(\ln x - \frac23)
E.None
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2

Determine ∫ln⁡(x2+1) dx\int \ln(x^2+1)\,dx.

A.xln⁡(x2+1)−2x+2tan⁡−1x+Cx\ln(x^2+1)-2x+2\tan^{-1}x+C
B.xln⁡(x2+1)+2x−2tan⁡−1x+Cx\ln(x^2+1)+2x-2\tan^{-1}x+C
C.xln⁡(x2+1)−2x−2tan⁡−1x+Cx\ln(x^2+1)-2x-2\tan^{-1}x+C
D.2xln⁡(x2+1)−2x+2tan⁡−1x+C2x\ln(x^2+1)-2x+2\tan^{-1}x+C
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3

Determine ∫x3ex dx\int x^3 e^x\,dx (repeated by-parts / reduction pattern).

A.(x3−3x2+6x−6)ex+C(x^3-3x^2+6x-6)e^x+C
B.(x3+3x2+6x+6)ex+C(x^3+3x^2+6x+6)e^x+C
C.(x3−3x2+6x−6)e−x+C(x^3-3x^2+6x-6)e^{-x}+C
D.x44ex+C\dfrac{x^4}{4}e^x+C
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