f(x)=x^5-20x^3+20x^2-21x+20

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Solution for f(x)=x^5-20x^3+20x^2-21x+20 equation: 


Simplifying
f(x) = x5 + -20x3 + 20x2 + -21x + 20

Multiply f * x
fx = x5 + -20x3 + 20x2 + -21x + 20

Reorder the terms:
fx = 20 + -21x + 20x2 + -20x3 + x5

Solving
fx = 20 + -21x + 20x2 + -20x3 + x5

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 + -21 + 20x + -20x2 + x4

Simplifying
f = 20x-1 + -21 + 20x + -20x2 + x4

Reorder the terms:
f = -21 + 20x-1 + 20x + -20x2 + x4

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