For which characteristic equation is the general solution of the form an=(c1+c2n)⋅2na_n = (c_1 + c_2 n) \cdot 2^nan=(c1+c2n)⋅2n?
r2−4r+4=0r^2 - 4r + 4 = 0r2−4r+4=0
r2−4r+3=0r^2 - 4r + 3 = 0r2−4r+3=0
r2−4r−5=0r^2 - 4r - 5 = 0r2−4r−5=0
r2+4=0r^2 + 4 = 0r2+4=0