f(x)=x^3+3x

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


Simplifying
f(x) = x3 + 3x

Multiply f * x
fx = x3 + 3x

Reorder the terms:
fx = 3x + x3

Solving
fx = 3x + x3

Solving for variable 'f'.

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

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

Simplifying
f = 3 + x2

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