# Math Help - integration

1. ## integration

I have tried this problem a million times, and many different ways, and I can't seem to figure out the right answer. Please help!! Thank you so much!

I have to solve:
integral from (-1) to (1) (lower limit -1 and upper limit 1) of the function: pi*((x^3)+1)^2.

I've integration by parts, I tried multiplying it out and doing it that way, and I get answers in all the ways I do it but I never get the same answer, and none of the answers I've gotten have been right.

2. Originally Posted by amaya
I have to solve:
integral from (-1) to (1) (lower limit -1 and upper limit 1) of the function: pi*((x^3)+1)^2.
Only actually concerns us $\int_{ - 1}^1 {\left( {x^3 + 1} \right)^2 } .$

Now just expand.

3. ## Same problem: integration

Concerning my last problem:
integral from -1 to 1 of ((x^3)+1)^2

I expanded....and I solved it and I got 2pi. But that's the incorrect answer...I don't know where I went wrong. help?

4. Show your work, since such answer is incorrect. (May be you're messing with some calculation there.)

5. ## integration

I went through my work once again and I figured out where I went wrong. I got (16/7)pi and summited into the computer and finally got the right answer. Thanks a lot!