What is z^2+y^2=9^2 ?

The solution to z^2+y^2=9^2 is Circle with (a,b)=(0,0),r=9

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z^2+y^2=9^2

z^{2} + y^{2} = 9^{2}

(a, b) = (0, 0), r = 9

Solution steps

z^{2} + y^{2} = 9^{2}

Rewrite

z^{2} + y^{2} = 9^{2}

in the form of the standard circle equation

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

Therefore the circle properties are:

(a, b) = (0, 0), r = 9

x^{2} - 12 x + y^{2} - 2 y - 12 = 0

3 x^{2} + 3 y^{2} - 12 x - 48 y = 0

(x - \frac{3}{5})^{2} + (y - \frac{1}{3})^{2} = 10^{2}

x^{2} + 10 x + y^{2} - 4 - 8 = 12

4 (x + 1)^{2} + 4 (y)^{2} = 121

What is z^2+y^2=9^2 ?
The solution to z^2+y^2=9^2 is Circle with (a,b)=(0,0),r=9