Recognize opportunity for integration by parts: Recognize the integral as an opportunity to use integration by parts. Integration by parts formula: ∫udv=uv−∫vdu Let u=x and dv=(x−1)5dx.
Differentiate u and integrate dv: Differentiate u and integrate dv.du=dx and v=∫(x−1)5dx. To find v, we need to integrate (x−1)5.
Integrate (x−1)5 using substitution: Integrate (x−1)5 using the substitution method.Let t=x−1, then dt=dx and when x=1, t=0.Now we integrate t5dt.
Calculate integral of t5: Calculate the integral of t5.∫t5dt=(61)t6+CNow we substitute back x−1 for t.v=(61)(x−1)6+C
Apply integration by parts formula: Apply the integration by parts formula.∫x(x−1)5dx=uv−∫vdu= x⋅[61(x−1)6+C]−∫[61(x−1)6+C]dx
Simplify expression and integrate remaining term: Simplify the expression and integrate the remaining term.=61x(x−1)6−61∫(x−1)6dxNow we need to integrate (x−1)6.
Integrate (x−1)6 using substitution: Integrate (x−1)6 using the substitution method.Let t=x−1, then dt=dx and when x=1, t=0.Now we integrate t6dt.
Calculate integral of t6: Calculate the integral of t6.∫t6dt=(71)t7+CNow we substitute back x−1 for t.∫(x−1)6dx=(71)(x−1)7+C
Substitute integral back into expression: Substitute the integral back into the expression.=61x(x−1)6−61×[71(x−1)7+C]=61x(x−1)6−421(x−1)7−6C
Combine constants and write final answer: Combine the constants and write the final answer.The indefinite integral of x(x−1)5 with respect to x is:I=61x(x−1)6−421(x−1)7+CWhere C is the constant of integration.
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