Write as a Function of x x^2+y=81

$x^{2} + y = 81$

Step 1

Subtract $x^{2}$ from both sides of the equation.

$y = 81 - x^{2}$

Step 2

To rewrite as a function of $x$ , write the equation so that $y$ is by itself on one side of the equal sign and an expression involving only $x$ is on the other side.

$f (x) = 81 - x^{2}$

Write as a Function of x x^2+y=81

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