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

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


Simplifying
f(x) = x4 + -4x3 + -9x2 + 36x

Multiply f * x
fx = x4 + -4x3 + -9x2 + 36x

Reorder the terms:
fx = 36x + -9x2 + -4x3 + x4

Solving
fx = 36x + -9x2 + -4x3 + 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 = 36 + -9x + -4x2 + x3

Simplifying
f = 36 + -9x + -4x2 + x3

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