Find the first four nonzero terms in a power series expansion about x = 0 for a general solution to the given differential equation. y' +(X + 8)y = 0 y(x) =+ ... (Type an expression in terms of a, that includes all terms up to order 3.) Find the first four nonzero terms in a power series expansion about x = 0 for a general solution to the given differential equation. (x2 + 4)y'' +y = 0 y(x) = +... (Type an expression in terms of a, and a, that includes all terms up to order 3.)