f(x)=9x^3-13x^2+20+2x^4-36x

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Solution for f(x)=9x^3-13x^2+20+2x^4-36x equation: 


Simplifying
f(x) = 9x3 + -13x2 + 20 + 2x4 + -36x

Multiply f * x
fx = 9x3 + -13x2 + 20 + 2x4 + -36x

Reorder the terms:
fx = 20 + -36x + -13x2 + 9x3 + 2x4

Solving
fx = 20 + -36x + -13x2 + 9x3 + 2x4

Solving for variable 'f'.

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

Divide each side by 'x'.
f = 20x-1 + -36 + -13x + 9x2 + 2x3

Simplifying
f = 20x-1 + -36 + -13x + 9x2 + 2x3

Reorder the terms:
f = -36 + 20x-1 + -13x + 9x2 + 2x3

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