How do i evaluate :
$$\sum_{n=1}^{\infty} n^{3}x^{n-1}$$
The answer is supposed to be: (according to wolfram alpha)
$$ \frac{x^2+4x+1}{(x-1)^4} $$
I have only learned to to this for simpler geometric sums.
Subscribe to:
Post Comments (Atom)
-
So if I have a matrix and I put it into RREF and keep track of the row operations, I can then write it as a product of elementary matrices. ...
-
I am asked to prove the density of irrationals in $\mathbb{R}$. I understand how to do this by proving the density of $\mathbb{Q}$ first, na...
-
Can someone just explain to me the basic process of what is going on here? I understand everything until we start adding 1's then after ...
No comments:
Post a Comment