SOLUTION: the circle with equation 2(x+4)^2+2(y-1)^2-18=0 has centre C and radius r units, where..?

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Question 1158137: the circle with equation 2(x+4)^2+2(y-1)^2-18=0 has centre C and radius r units, where..?
Answer by Edwin McCravy(20054)   (Show Source): You can put this solution on YOUR website!
Learn that



is the equation of a circle with center (h,k) and radius r units.  

Your equation is 



Make it look like this:

      

Divide every term by 2





Add +9 to both sides:



Now it looks like 



-h = +4;   -k = -1
 h = -4;    k =  1
 r² = 9
  r = 3

Therefore the center is (-4,1) and the radius in 3, and the
graph looks like this:



Edwin
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