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Yes, it does look promising.
Thank you very much.
And after substituting back u for x I have:
But now if I differentiate it back:
Where did 9 come from?
Can you continue from here?
In my homework for this week I have a question:
If I do a substitution u=3x+25, then I have
Which does not help much.
If I try to find such u that du will eliminate x from numerator, then: du=1/x dx and u have to be ln(x)
Which is also not very helpful...
Finally I run the original integral through Maxima, and it gave me:
Which is very scary and I have no idea how it come to this formula.
So which "u" should I use? How to find such "u"? Or maybe there is another approach I should use? I am completely stuck.