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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- November 6th 2007, 12:12 PM #1

- November 6th 2007, 12:16 PM #2

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- November 6th 2007, 01:12 PM #4