What is the characteristic equation for the recurrence an=5an−1−8an−2+4an−3a_n = 5a_{n-1} - 8a_{n-2} + 4a_{n-3}an=5an−1−8an−2+4an−3?
r3−5r2+8r−4=0r^3 - 5r^2 + 8r - 4 = 0r3−5r2+8r−4=0
r3+5r2+8r+4=0r^3 + 5r^2 + 8r + 4 = 0r3+5r2+8r+4=0
r3−5r2−8r−4=0r^3 - 5r^2 - 8r - 4 = 0r3−5r2−8r−4=0
r3−4r2+8r−5=0r^3 - 4r^2 + 8r - 5 = 0r3−4r2+8r−5=0