f(x)=x^4+10x^3+30x^2+20x-16

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Solution for f(x)=x^4+10x^3+30x^2+20x-16 equation: 


Simplifying
f(x) = x4 + 10x3 + 30x2 + 20x + -16

Multiply f * x
fx = x4 + 10x3 + 30x2 + 20x + -16

Reorder the terms:
fx = -16 + 20x + 30x2 + 10x3 + x4

Solving
fx = -16 + 20x + 30x2 + 10x3 + 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 = -16x-1 + 20 + 30x + 10x2 + x3

Simplifying
f = -16x-1 + 20 + 30x + 10x2 + x3

Reorder the terms:
f = 20 + -16x-1 + 30x + 10x2 + x3

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