The result of the function f(f(-1)) is 0
Given the function
f(x) = 4x + 4
f(f(x)) = 4(4x+4)
f(x(x)) = 16x + 16
Substitute x = -1 into the expression to get f(f(-1))
f(f(-1)) = 16 (-1) + 16
f(f(-1)) = -16 + 16
f(f(-1)) = 0
Hence the result of the function f(f(-1)) is 0
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