f(x)=3x^3-9x

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Solution for f(x)=3x^3-9x equation: 


Simplifying
f(x) = 3x3 + -9x

Multiply f * x
fx = 3x3 + -9x

Reorder the terms:
fx = -9x + 3x3

Solving
fx = -9x + 3x3

Solving for variable 'f'.

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

Divide each side by 'x'.
f = -9 + 3x2

Simplifying
f = -9 + 3x2

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