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c4 maths

can someone help me with this question?
∫ (ln x)^3 / x
(edited 7 years ago)
Reply 1
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Bruhh
10
whats the question...?
Reply 2
Avatar for 619-booyaka
619-booyaka
OP
Original post by Bruhh
whats the question...?


integrate (ln x)^3 / x By recognising a function and its derivative, or by using a suitable substitution, integrate withrespect to x.
Reply 3
Avatar for Bruhh
Bruhh
10
Think about the derivative of ln(x) and then see if you can think what substitution to use.
Original post by 619-booyaka
can someone help me with this question?
∫ (ln x)^3 / x


By parts (label it as I you should see your original integral if you do it by parts)
Reply 5
Avatar for Bruhh
Bruhh
10
Original post by Middriver
By parts (label it as I you should see your original integral if you do it by parts)


If it says how to do it in the question why would you use parts?....
Original post by Bruhh
If it says how to do it in the question why would you use parts?....


Oh it's just the way I read the question the function would be the integral of v' and the derrivative would be u'. Could be wrong it's very simple by parts. What would you use for your substitute?
Reply 7
Avatar for 619-booyaka
619-booyaka
OP
Original post by Middriver
Oh it's just the way I read the question the function would be the integral of v' and the derrivative would be u'. Could be wrong it's very simple by parts. What would you use for your substitute?


i used ln x and i got the right answer.
(edited 7 years ago)
Original post by 619-booyaka
i used ln x and i got the right answer.


Fair enough I'm sure both ways are suitable.
Reply 9
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619-booyaka
OP
Original post by Middriver
Fair enough I'm sure both ways are suitable.

if i were to try doing it by parts would i make ln x as v' or as u?
Original post by 619-booyaka
if i were to try doing it by parts would i make ln x as v' or as u?


Ln(X) as U but make sure you label the integral I=

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