What is x^2-16x+y^2+8y+80=81 ?

The solution to x^2-16x+y^2+8y+80=81 is Circle with (a,b)=(8,-4),r=9

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x^2-16x+y^2+8y+80=81

x^{2} - 16 x + y^{2} + 8 y + 80 = 81

(a, b) = (8, - 4), r = 9

Solution steps

x^{2} - 16 x + y^{2} + 8 y + 80 = 81

Rewrite

x^{2} - 16 x + y^{2} + 8 y + 80 = 81

in the form of the standard circle equation

(x - 8)^{2} + (y - (- 4))^{2} = 9^{2}

Therefore the circle properties are:

(a, b) = (8, - 4), r = 9

x^{2} + y^{2} - 10 x - 10 y = - 25

4 x^{2} + 40 x + 4 y^{2} - 32 y = 5

x^{2} + y^{2} - 6 x - 2 y + 1 = 0

x^{2} + y^{2} + 2 x - 6 y = 0

x^{2} + y^{2} + 4 x - 12 y + 3 = 0

What is x^2-16x+y^2+8y+80=81 ?
The solution to x^2-16x+y^2+8y+80=81 is Circle with (a,b)=(8,-4),r=9