# How do i integrate this "e^[−(x/xa)]

1. Apr 7, 2009

### cutlerblows

how do i integrate this "e^[−(x/xa)]

2. Apr 7, 2009

### Staff: Mentor

Re: help

Does xa mean x*a, or is it a variable different from x?

3. Apr 7, 2009

### Focus

Re: help

Errr... Do you mean $e^{\frac{x}{xa}}$ ? If so just cancel the x. You also need to show some working out and should have a more discriptive title. We are here to help not to do homework.

4. Apr 7, 2009

### HallsofIvy

Re: help

On the other hand if you mean xa, some fixed (constant) value, then use the substitution u= x/xa.

5. Apr 7, 2009

### cutlerblows

Re: help

i meant x subscript a. but i figured out the answer. and fyi this is not my homework. im studying for my physics test. but thanks for being rude..........