((x^2)+1)^2 using substitution

[Sidthewall]

Homework Statement

((x^2)+1)^2 integrate using substitution

Homework Equations

3. The attempt at solution
ok so i let u= x^2 + 1
du/dx = 2x
du= 2xdx
where do i go from there

 

[Mark44]

Homework Statement

((x^2)+1)^2 using substitution

Do what with ((x^2)+1)^2 using substitution?

Homework Equations

3. The attempt at solution
ok so i let u= x^2 + 1
du/dx = 2x
du= 2xdx
where do i go from there

 

[Sidthewall]

integrate using substitution, my bad forgot to put that down

 

[Mark44]

That's the reason for this:

Homework Statement

So is this it?
\int (x^2 + 1)^2 dx

I wouldn't use substitution for this one.

 

[Sidthewall]

I wouldn't either. I would expand and then solve but the question said to use substitution

 

[vela]

The substitution u=x²+1 won't help. What substitution does the form x²+1 suggest? Think trig functions.