I have to simplify this to get the equation of a circle:

(x-4)^2 +4^2 + (x-2)^2 - 2^2 +11 = 0

I get:

(x-4)^2 + (x-2)^2 +16 + 4 + 11 = 0

(x-4)^2 + (x-2)^2 = -31

....where am I going wrong?

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- Nov 6th 2007, 11:12 AM #1

- Nov 6th 2007, 11:16 AM #2

- Nov 6th 2007, 11:22 AM #3

- Nov 6th 2007, 12:12 PM #4