Posted by ggift on Monday, September 14, 2009 at 10:24pm.
I assume you meant
(x+2)^2 + (y-6)^2 = 16 and (x+2)^2 + (y+6)^2= 81
you state that the two circles are concentric, but according to your equations the first one has a centre of (-2,6) and (-2,-6) so there is clearly a typo.
yes all the 2's outside of the parenthesis are squared
Please verify and correct the typo.
The question says the circles are concentric, but the equations give two circles of radii 4 and 9 which intersect each other.
Would the circles be non-concentric, or one of the equations had a typo?
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