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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