Which of the following is the characteristic equation for an=4an−1+5an−2a_n = 4a_{n-1} + 5a_{n-2}an=4an−1+5an−2?
r2−4r−5=0r^2 - 4r - 5 = 0r2−4r−5=0
r2+4r+5=0r^2 + 4r + 5 = 0r2+4r+5=0
r2−4r+5=0r^2 - 4r + 5 = 0r2−4r+5=0
r2−5r−4=0r^2 - 5r - 4 = 0r2−5r−4=0