f(x)=x^4+3x^2+7

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Solution for f(x)=x^4+3x^2+7 equation: 


Simplifying
f(x) = x4 + 3x2 + 7

Multiply f * x
fx = x4 + 3x2 + 7

Reorder the terms:
fx = 7 + 3x2 + x4

Solving
fx = 7 + 3x2 + 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 = 7x-1 + 3x + x3

Simplifying
f = 7x-1 + 3x + x3

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