If a recurrence has the solution an=c15n+c2(−5)na_n = c_1 5^n + c_2 (-5)^nan=c15n+c2(−5)n, what is the recurrence?
an=25an−2a_n = 25a_{n-2}an=25an−2
an=5an−1−5an−2a_n = 5a_{n-1} - 5a_{n-2}an=5an−1−5an−2
an=5an−1+25an−2a_n = 5a_{n-1} + 25a_{n-2}an=5an−1+25an−2
an=−25an−2a_n = -25a_{n-2}an=−25an−2