f(f(x))=9x-4

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Solution for f(f(x))=9x-4 equation: 


Simplifying
f(f(x)) = 9x + -4

Multiply f * x
f(fx) = 9x + -4

Multiply f * fx
f2x = 9x + -4

Reorder the terms:
f2x = -4 + 9x

Solving
f2x = -4 + 9x

Solving for variable 'f'.

Move all terms containing f to the left, all other terms to the right.

Divide each side by 'x'.
f2 = -4x-1 + 9

Simplifying
f2 = -4x-1 + 9

Reorder the terms:
f2 = 9 + -4x-1

Reorder the terms:
-9 + f2 + 4x-1 = 9 + -4x-1 + -9 + 4x-1

Reorder the terms:
-9 + f2 + 4x-1 = 9 + -9 + -4x-1 + 4x-1

Combine like terms: 9 + -9 = 0
-9 + f2 + 4x-1 = 0 + -4x-1 + 4x-1
-9 + f2 + 4x-1 = -4x-1 + 4x-1

Combine like terms: -4x-1 + 4x-1 = 0
-9 + f2 + 4x-1 = 0

The solution to this equation could not be determined.

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