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