f(x)=2*x*x+1

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Solution for f(x)=2*x*x+1 equation: 


Simplifying
f(x) = 2x * x + 1

Multiply f * x
fx = 2x * x + 1

Multiply x * x
fx = 2x2 + 1

Reorder the terms:
fx = 1 + 2x2

Solving
fx = 1 + 2x2

Solving for variable 'f'.

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

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

Simplifying
f = x-1 + 2x

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