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y = f(x) = -2^x
f(-1) = -(2^-1) = -1/2
f(1) = -(2^1) = -2
f(3) = -(2^3) = -8
e.
y = f(x) = 3 . 2^x - 2
f(-1) = 3 . 2^-1 - 2 = 3 . 1/2 - 2 = 3/2 - 4/2 = -1/2
f(1) = 3 . 2^1 - 2 = 6 - 2 = 4
f(3) = 3 . 2^3 - 2 = 24 - 2 = 22