To find x(1), we need to plug in t=1 into the given equation:
x(1) - x(0) = 2 + 3(1) - (1)^2
x(1) - x(0) = 2 + 3 - 1
x(1) - x(0) = 4
x(1) = x(0) + 4

Since x(0) is not given, x(1) cannot be determined.

To find x(5), we need to plug in t=5 into the given equation:
x(5) - x(0) = 2 + 3(5) - (5)^2
x(5) - x(0) = 2 + 15 - 25
x(5) - x(0) = -8
x(5) = x(0) - 8

Since x(0) is not given, x(5) cannot be determined.