Posted by **Sara** on Friday, March 21, 2008 at 6:40pm.

find center and radius of circle

(x-6)^2+(y+9)^2=121

-(x-6)^2 -(x-6)^2

(y+9)^2=121-121-(x-6)^2

(y+9)^2=+/- 121-(x-6)^2

-9 -9

y=-9+/-121-(x-6)^2

does anyone know is this the answer or do I go further???????????????????????

- algebra -
**Reiny**, Friday, March 21, 2008 at 7:01pm
Your equation is already in the standard form of

(x-h)^2 + (y-k)^2 = r^2

where (h,k) is the centre and the radius is r

so for (x-6)^2+(y+9)^2=121

the centre is (6,-9) and the radius is 11

I have no clue what you were trying to do in your solution

.

Also this is the third student who has statements like your

-9 -9

in a sequential solution.

What is that supposed to mean?

Are you all from the same class?

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