What is the characteristic equation for an=7an−1−10an−2a_n = 7a_{n-1} - 10a_{n-2}an=7an−1−10an−2?
r2−7r+10=0r^2 - 7r + 10 = 0r2−7r+10=0
r2+7r+10=0r^2 + 7r + 10 = 0r2+7r+10=0
r2−10r+7=0r^2 - 10r + 7 = 0r2−10r+7=0
r2+10r−7=0r^2 + 10r - 7 = 0r2+10r−7=0