# If U is uniform on [−1, 1], find the density function of U^2.

1. Jan 22, 2012

### number0

1. The problem statement, all variables and given/known data

If U is uniform on [−1, 1], find the density function of U^2.

2. Relevant equations

f(u) = 1/(b-a)

3. The attempt at a solution

I actually solved the problem already, but I am having trouble defining what the boundaries are for U^2. My work is uploaded in paint.

Any help would be appreciated. Thanks.

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2. Jan 22, 2012

### I like Serena

Hi number0!

The integral in your solution runs from -√x to +√x, but that is only true if they are within the bounds of your uniform distribution.
If they are outside, you have values of x for which your integral bounds need to be modified, which in turn will result in other values for your density function.

If you do this, you will find your boundaries for U^2 implicitly.

3. Jan 22, 2012

### number0

I do not know if I did it correctly, but in my solution, I got the boundaries to be 0 < X <= 1. Is this correct?

4. Jan 22, 2012

### I like Serena

Yes.

5. Jan 22, 2012

### number0

Thank you so much :)