f(3x)=3x^2+4

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Solution for f(3x)=3x^2+4 equation: 


Simplifying
f(3x) = 3x2 + 4

Remove parenthesis around (3x)
f * 3x = 3x2 + 4

Reorder the terms for easier multiplication:
3f * x = 3x2 + 4

Multiply f * x
3fx = 3x2 + 4

Reorder the terms:
3fx = 4 + 3x2

Solving
3fx = 4 + 3x2

Solving for variable 'f'.

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

Divide each side by '3x'.
f = 1.333333333x-1 + x

Simplifying
f = 1.333333333x-1 + x

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