Integral problem, does b & a change sometime in the problem?

[pillar]

Problem number 16
http://img29.imageshack.us/img29/3179/38653938.png
For the record the y at the end is cubed. Thanks in advance.

 

[snipez90]

If you are referring to the limits of integration, then yes they change if you make the proper substitution that makes this integral very easy.

 

[Feldoh]

What do you mean by: "do b and a change sometime?" Are you talking about the limits of integration changing?

 

[pillar]

What do you mean by: "do b and a change sometime?" Are you talking about the limits of integration changing?

Yes the bounds or limits. b=2 and a=0 Why do they change to other numbers later on during the problem?

 

[zcd]

If you substitute, for example, u=1+y^3, then the limits will change from y_a=0, y_b=2 to u_a=1 and u_b=9. That's because you're integrating with respect to u instead of y.