# Math Help - integral

1. ## integral

I tried substitution but it didn't work. please help. thanks

2. ## Re: integral

Change of variable t=(1+x2+x4)
dt = ( ? ? ? )dx

3. ## Re: integral

this is what i did: let u=1+x^2+x^4 . then i tried u substitution. u'= 2x +4x^3 but wasn;t sure what (???)dx would be.

the answer however is 1/23 ( 1+x^2+x^4)^46 + c

u'=du/dx
du = (u')dx

5. ## Re: integral

Hey! I gave the same answer in your other thread pls help to find integral.

- Hollywood