f(x)=16-81x^2

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Solution for f(x)=16-81x^2 equation: 


Simplifying
f(x) = 16 + -81x2

Multiply f * x
fx = 16 + -81x2

Solving
fx = 16 + -81x2

Solving for variable 'f'.

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

Divide each side by 'x'.
f = 16x-1 + -81x

Simplifying
f = 16x-1 + -81x

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