How do I go about solving this one? There are t's but it has dx

I made

but isn't equal to , right?

What do I do?

Thanks, chickeneaterguy

- Nov 21st 2010, 09:21 AMchickeneaterguyHard (or maybe it's not?) u-substitution definite integral problem

**How do I go about solving this one? There are t's but it has dx**

I made

but isn't equal to , right?

What do I do?

Thanks, chickeneaterguy - Nov 21st 2010, 09:25 AMAlso sprach Zarathustra
You can solve it without any kind of substitution, take a look at the integrand...

- Nov 21st 2010, 09:28 AMchickeneaterguy
it's on my practice exam and I'm required to solve it with u-sub :(

- Nov 21st 2010, 09:30 AMUnknown008
I think that the question made a typo and put dx istead of dt.

And du/dt is indeed 4t^3

Don't forget to change the limits when you make the substitution. - Nov 21st 2010, 09:30 AMHardwork
- Nov 21st 2010, 09:34 AMchickeneaterguy
That's what I thought too as he hasn't taught us how to do this. He has taught us and stuff like that but if I do it that way, it doesn't give me a specific value. I look at the graph and it's apparent that the area should be zero, but yeah...must be a typo.

This is just Calc 1, have you seen problem/s like this before? - Nov 21st 2010, 09:36 AMAlso sprach Zarathustra
It is dt and not dx!

If it was dx the answer is 2t^3(1+t^4)^3 - Nov 21st 2010, 09:38 AMUnknown008
- Nov 21st 2010, 09:41 AMAlso sprach Zarathustra
- Nov 21st 2010, 09:42 AMAlso sprach Zarathustra
- Nov 21st 2010, 09:48 AMHardwork
- Nov 21st 2010, 09:48 AMchickeneaterguy
I just did it with , thanks for helping though. :)

- Nov 21st 2010, 12:01 PMminusb
- Nov 21st 2010, 12:09 PMchickeneaterguy