If I need to find a closed solution for the summation of x*a^x from x = 0 to n, what do I do? For starters, I've decided to do an integral from 0 to b of the same function, but now I have 2 variables! ah! Help please :D

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I can't seem to do a u-sub that will work for me.

I want to assume that x is a constant and pull it outside, but I don't know if I can do that.

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