Here are the values and computations that give them:

x -3-2-10123
f(x) = 3(2x)
3(2-3) =
3

8
3(2-2) =
3

4
3(2-1) =
3

2
3(20) = 3(1) = 3
3(21) = 6
3(22) = 12
3(23) = 24


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