Find the Expanded Form (x-0)^2+(y-0)^2=9^2

${(x - 0)}^{2} + {(y - 0)}^{2} = 9^{2}$

Simplify each term.

Subtract $0$ from $x$ .

$x^{2} + {(y - 0)}^{2} = 9^{2}$

Subtract $0$ from $y$ .

$x^{2} + y^{2} = 9^{2}$

Raise $9$ to the power of $2$ .

$x^{2} + y^{2} = 81$

Subtract $81$ from both sides of the equation.

$x^{2} + y^{2} - 81 = 0$