Homework Help: Integral calculus

Posted by Tommy on Friday, April 20, 2012 at 10:33pm.

Yesterday I posted this number that I don't understand. There was a mistake in the question,this is the right one:

∫ (5^(3/x) - (x^8 + 9)^1/3 ) / 3x^2

will u, for sub. be = x^8 + 9?
Then du is = 8x^7 dx
x^7 dx = 1/8 du

Thank you!

Integral calculus - Reiny, Friday, April 20, 2012 at 11:00pm
As Steve mentioned yesterday for this same question, the 5^(3/x) is a stopper.

I put your expression in the Wolfram integrator with the necessary changes in brackets, and frankly I don't even want to understand their answer.

http://integrals.wolfram.com/index.jsp?expr=%285%5E%283%2Fx%29+-+%28x%5E8+%2B+9%29%5E%281%2F3%29+%29+%2F+%283x%5E2%29&random=false
Integral calculus - Steve, Saturday, April 21, 2012 at 5:41am
Actually, I have to reconsider.

If u = 5^(3/x)
du = ln5 5^(3/x) (-3/x^2)

we have the form, and we end up with

∫ (5^(3/x) - (x^8 + 9)^1/3 ) / 3x^2 dx
= -1/(9ln5) ∫ u - (x^8 + 9)^1/3 ) du

The show stopper is that ∛(x^8+9)
Integral calculus - Tommy, Saturday, April 21, 2012 at 10:59am
Thank you both for taking your time to try this :)

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