f(-1)=x^4-2x^3+x^2+x-1

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Solution for f(-1)=x^4-2x^3+x^2+x-1 equation: 


Simplifying
f(-1) = x4 + -2x3 + x2 + x + -1

Reorder the terms for easier multiplication:
-1f = x4 + -2x3 + x2 + x + -1

Reorder the terms:
-1f = -1 + x + x2 + -2x3 + x4

Solving
-1f = -1 + x + x2 + -2x3 + x4

Solving for variable 'f'.

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

Divide each side by '-1'.
f = 1 + -1x + -1x2 + 2x3 + -1x4

Simplifying
f = 1 + -1x + -1x2 + 2x3 + -1x4

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