f(x)=x^4+9x^3-4x-1

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Solution for f(x)=x^4+9x^3-4x-1 equation: 


Simplifying
f(x) = x4 + 9x3 + -4x + -1

Multiply f * x
fx = x4 + 9x3 + -4x + -1

Reorder the terms:
fx = -1 + -4x + 9x3 + x4

Solving
fx = -1 + -4x + 9x3 + x4

Solving for variable 'f'.

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

Divide each side by 'x'.
f = -1x-1 + -4 + 9x2 + x3

Simplifying
f = -1x-1 + -4 + 9x2 + x3

Reorder the terms:
f = -4 + -1x-1 + 9x2 + x3

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