What is the characteristic equation for an=4an−1−3an−3a_n = 4a_{n-1} - 3a_{n-3}an=4an−1−3an−3?
r3−4r2+3=0r^3 - 4r^2 + 3 = 0r3−4r2+3=0
r3−4r2+3r=0r^3 - 4r^2 + 3r = 0r3−4r2+3r=0
r3−4r+3=0r^3 - 4r + 3 = 0r3−4r+3=0
r2−4r+3=0r^2 - 4r + 3 = 0r2−4r+3=0