f(x)=81-x^2

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


Simplifying
f(x) = 81 + -1x2

Multiply f * x
fx = 81 + -1x2

Solving
fx = 81 + -1x2

Solving for variable 'f'.

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

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

Simplifying
f = 81x-1 + -1x

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