15. -/6.25 points ZilDiffE09 6.2.017 Find two power series solutions of the given differential equation about the ordinary point x = 0 (x2 + 2)y" 5xy' -y-0 x2 11x4 4 96 3 6 y1 = 1 + + and y2 =x--+--.. 96 3 6 4 x2 11x4 4 x2 11x4 96 3 6 and y2 =x--+--.. 96 3 6 x2 11x4 4 and y2=x- 96 3 6 16. + -/6.25 points ZillDiffEQ9 6.2.020 Use the power series method to solve the given initial-value problem. (Enter the first four nonzero terms.) (x + 1)y"-(2-x)y' + y = 0, y(0) = 4, y'(0)--1