A second order discrete system is characterized by the difference equation.
y(n) – 3y(n – 1) + 2y(n – 2) = x(n) – 2x(n – 1)
The initial conditions are given as y(-1) = y(-2) = 1.
The value of y(3) and x(n) = u(n) when n ≥ 0 is ______Enter numerical value using the virtual keypad. Round off where necessary.