f(x)=120x-.4x^4+1000

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Solution for f(x)=120x-.4x^4+1000 equation: 


Simplifying
f(x) = 120x + -0.4x4 + 1000

Multiply f * x
fx = 120x + -0.4x4 + 1000

Reorder the terms:
fx = 1000 + 120x + -0.4x4

Solving
fx = 1000 + 120x + -0.4x4

Solving for variable 'f'.

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

Divide each side by 'x'.
f = 1000x-1 + 120 + -0.4x3

Simplifying
f = 1000x-1 + 120 + -0.4x3

Reorder the terms:
f = 120 + 1000x-1 + -0.4x3

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