Question : Represent the function \displaystyle \frac{9}{(1 - 5 x)^2} as a

Represent the function \displaystyle \frac{9}{(1 - 5 x)^2} as a power series \displaystyle f(x) = \sum_{n=0}^\infty c_n x^n c_0 = c_1 = c_2 = c_3 = c_4 = Find the radius of convergence R = .