f(x)=x^4+4x^3-16x^2-64x

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Solution for f(x)=x^4+4x^3-16x^2-64x equation: 


Simplifying
f(x) = x4 + 4x3 + -16x2 + -64x

Multiply f * x
fx = x4 + 4x3 + -16x2 + -64x

Reorder the terms:
fx = -64x + -16x2 + 4x3 + x4

Solving
fx = -64x + -16x2 + 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 = -64 + -16x + 4x2 + x3

Simplifying
f = -64 + -16x + 4x2 + x3

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