If an=rna_n = r^nan=rn is a solution to an=6an−1−8an−2a_n = 6a_{n-1} - 8a_{n-2}an=6an−1−8an−2, which equation must rrr satisfy?
r2+6r−8=0r^2 + 6r - 8 = 0r2+6r−8=0
r2−6r+8=0r^2 - 6r + 8 = 0r2−6r+8=0
r2−8r+6=0r^2 - 8r + 6 = 0r2−8r+6=0
r−6+8=0r - 6 + 8 = 0r−6+8=0