HELP: What is the general form of the equation for the given circle? x2 + y2 − 8x − 8y + 23 = 0 x2 + y2 − 8x − 8y + 32 = 0 x2 + y2 − 4x − 4y + 23 = 0 x2 + y2 + 4x + 4y + 9 = 0

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HELP: What is the general form of the equation for the given circle? x2 + y2 − 8x − 8y + 23 = 0 x2 + y2 − 8x − 8y + 32 = 0 x2 + y2 − 4x − 4y + 23 = 0 x2 + y2 + 4x + 4y + 9 = 0

Mathematics
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you could do this by plugging in the given values of x and y which are on the circle and see which option fits
for example try point A = (4,7) on first option left side of the equation = 4^2 + 7^2 - 8(4) - 8(7) + 23 = 0 so that satisfies the equation but now we have to try the other point (7,4) if that gives 0 then we have the correct equation

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Other answers:

what does 7^2 + 4^2 - 8(7) - 8(4) + 23 work out to?
- compare it with my first post...
* second post
does that work out to zero?
yes your right if u plug in the other point (7,4) u get 0 as your final answer
yes you do so that is the required equation because it satisfies the 2 points (4,7) and (7,4)
first option is the one
so its A
yea
and your right thanks for the help!
yw

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