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