f(x)=x^3+3x-21

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Solution for f(x)=x^3+3x-21 equation: 


Simplifying
f(x) = x3 + 3x + -21

Multiply f * x
fx = x3 + 3x + -21

Reorder the terms:
fx = -21 + 3x + x3

Solving
fx = -21 + 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 = -21x-1 + 3 + x2

Simplifying
f = -21x-1 + 3 + x2

Reorder the terms:
f = 3 + -21x-1 + x2

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