Question $4$

Solve the following recurrence relations together with the initial conditions given.

a$)a_n=6a_{n-1}-8a_{n-2}$ for $n2,$

$a_0=4,a_1=10$

b$)a_n=2a_{n-1}-a_{n-2}$ for $n2,$

$a_0=4,a_1=1$