If an=5an−1−6an−2a_n = 5a_{n-1} - 6a_{n-2}an=5an−1−6an−2, and the solution is an=c12n+c23na_n = c_1 2^n + c_2 3^nan=c12n+c23n, what is the characteristic equation?
r2−5r+6=0r^2 - 5r + 6 = 0r2−5r+6=0
r2+5r−6=0r^2 + 5r - 6 = 0r2+5r−6=0
r2−6r+5=0r^2 - 6r + 5 = 0r2−6r+5=0
r2+5r+6=0r^2 + 5r + 6 = 0r2+5r+6=0