SOLUTION: the circle c1 has centre a and equation x2+y2-6x+2y-15=0 find the co-ordinates of A and the radius of C

Algebra ->  Surface-area -> SOLUTION: the circle c1 has centre a and equation x2+y2-6x+2y-15=0 find the co-ordinates of A and the radius of C      Log On


   

Question 451994: the circle c1 has centre a and equation x2+y2-6x+2y-15=0
find the co-ordinates of A and the radius of C
Answer by Gogonati(855) About Me  (Show Source):
You can put this solution on YOUR website!
First write the equation of the circle in the standard form.
%28x%5E2-6x%2B9%29-9%2B%28y%5E2%2B2y%2B1%29-1-15=0=>%28x-3%29%5E2%2B%28y%2B1%29%5E2=5%5E2, from the final
equation we conclude that the center of the circle is (3, -1) and the radius 5.