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**SecondxChance1** Thanks! I managed to figure it out now.

However, I'm stumped on another question now. Same situation as before, where I need to figure out whether it's converging or diverging.

This time it's the integral from negative infinity to positive infinity of x e^-x^2 dx

I tried letting u = -x^2, du = -2dx

Which gave me -1/2 int e^u du and that integrates into just -1/2e^u

I split the limit up at 0, so I had the limit from negative infinity to zero and from zero to positive infinity. I tried working it out from here, but never managed to get the right answer. What I would like to know is this first part is right, and if not, how should I set up this problem?