a) To find the value of x when f(x) = 0, we set f(x) = 3x - 2 equal to 0 and solve for x:

3x - 2 = 0
3x = 2
x = 2/3

Therefore, when f(x) = 0, x = 2/3.

b) To find the value of x when f(x) = -2, we set f(x) = 3x - 2 equal to -2 and solve for x:

3x - 2 = -2
3x = 0
x = 0

Therefore, when f(x) = -2, x = 0.