Represent the function f(x) = x/(1+4x)^2 as a power series and determine the radius of convergence.
so the correct answer is (-1)^n * (n+1) *4^n*x^(n+1) but this is what I got:
x series sign (-4x)^n
series sign (-1)^n * 4^n x^(n+1)
Where did the (n+1) in front of the 4^n come from?