fx=x^4-4x^2+15

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Solution for fx=x^4-4x^2+15 equation: 


Simplifying
fx = x4 + -4x2 + 15

Reorder the terms:
fx = 15 + -4x2 + x4

Solving
fx = 15 + -4x2 + 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 = 15x-1 + -4x + x3

Simplifying
f = 15x-1 + -4x + x3

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