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