please help be solve a and d... please explain in details..

Solve the following recurrence equations using the characteristic equation. (a) tn = 4tn-1 3tn-2 for n > 1 to = 0 ti = 1 (b) tn = 3tn1 2tn-2+ n2 for n > 1 to = 0 (c) tn = 5tn-1 - 6tn-2 + 5" for n > 1 to = 0 t =1 (d) tn = 5n-1 - 6tn-2 + n2 - 5n+ 7" to = 0 t =1 for n > 1