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