f(3x)=x^2-12

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Solution for f(3x)=x^2-12 equation: 


Simplifying
f(3x) = x2 + -12

Remove parenthesis around (3x)
f * 3x = x2 + -12

Reorder the terms for easier multiplication:
3f * x = x2 + -12

Multiply f * x
3fx = x2 + -12

Reorder the terms:
3fx = -12 + x2

Solving
3fx = -12 + x2

Solving for variable 'f'.

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

Divide each side by '3x'.
f = -4x-1 + 0.3333333333x

Simplifying
f = -4x-1 + 0.3333333333x

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