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**the fundamental theorem of calculus**

## Homework Statement

[tex]\int^{3}_{2}[/tex]12 * (x^2-4)^(5) * x

## Homework Equations

U substitution.

## The Attempt at a Solution

This is part of a FTC problem, but I find myself stumbling a little bit with the u substitution still. I'm not sure when the du= the derivative of the u, and when it is just the numbers left over.

Like in this situation, I set u=x^2-4. Would du=2x or 12x?

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