SOLUTION: find the radius of the circle by using this equation: 3x^2+3y^2+42x+42y+186=0.

Algebra ->  Circles -> SOLUTION: find the radius of the circle by using this equation: 3x^2+3y^2+42x+42y+186=0.      Log On


   

Question 388036: find the radius of the circle by using this equation: 3x^2+3y^2+42x+42y+186=0.
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Complete the square in x and y.
3x%5E2%2B3y%5E2%2B42x%2B42y%2B186=0
x%5E2%2B14x%2By%5E2%2B14x%2B62=0
%28x%5E2%2B14x%2B49%29%2B%28y%5E2%2B14y%2B49%29%2B62=49%2B49
%28x%2B7%29%5E2%2B%28y%2B7%29%5E2=98-62
%28x%2B7%29%5E2%2B%28y%2B7%29%5E2=36
.
.
.
R=sqrt%2836%29=highlight%286%29