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

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


Simplifying
f(x) = (3x) + -1(x3)

Multiply f * x
fx = (3x) + -1(x3)

Solving
fx = (3x) + -1x3

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 + -1x2

Simplifying
f = 3 + -1x2

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