a. need to differentiate 1/(1+x)^2 to find power series representation and the radius of convergence. (think that is the quotient rule)

(....= -2x/(1+x)^4 ??)

b. use part a to find power series 1/(1+x)^3

c. then use b to find power series for x^2/(1+x)^3

please help for this one, i'm confused throughout the entire problem.