What is the characteristic equation for an=5an−1−6an−2+2na_n = 5a_{n-1} - 6a_{n-2} + 2^nan=5an−1−6an−2+2n?
r2−5r+6=0r^2 - 5r + 6 = 0r2−5r+6=0
r2+5r−6=0r^2 + 5r - 6 = 0r2+5r−6=0
r2−5r+6−2=0r^2 - 5r + 6 - 2 = 0r2−5r+6−2=0
r2−5r+2=0r^2 - 5r + 2 = 0r2−5r+2=0