how to make autoregressive random process signal

I have this equation x(n)=1.558x(n-1)-0.81x(n-2)+v(n) where x(n) is autoregressive random process and v(n) has variance equal 1 I know how to make it but I need to find x(n-1) and x(n-2) to use them as a matrix like x(n) in another equation in my code can you help me how to find them "x(n-1) & x(n-2)" ??