f(x) = 4x is the answer
if you look at the table you will see the x values are - 2, -1 , 0 and 1 . The f(x) function fits f(x) = 4x
f(x) = 4(-2) = - 8
f(x) = 4(-1) = - 4
f(x) = 4(0) = 0
f(x) = 4(1) = 4
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