What is x^2+(y+9)^2=81 ?

The solution to x^2+(y+9)^2=81 is Circle with (a,b)=(0,-9),r=9

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x^2+(y+9)^2=81

x^{2} + (y + 9)^{2} = 81

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

Solution steps

x^{2} + (y + 9)^{2} = 81

Rewrite

x^{2} + (y + 9)^{2} = 81

in the form of the standard circle equation

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

Therefore the circle properties are:

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

(x + 2)^{2} - 4 + (y - 1)^{2} + 1 = 0

x^{2} + y^{2} - 8 x + 4 y = - 16

(x - 4)^{2} + (y - 1)^{2} = (53)^{2}

(x - 1)^{2} + (y - 3)^{2} = 8

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

What is x^2+(y+9)^2=81 ?
The solution to x^2+(y+9)^2=81 is Circle with (a,b)=(0,-9),r=9