SOLUTION: The equation of a circle is x2+y2+8x−14y+56=0 . What is the radius of the circle? Enter your answer in the box. r = ?

Algebra ->  Circles -> SOLUTION: The equation of a circle is x2+y2+8x−14y+56=0 . What is the radius of the circle? Enter your answer in the box. r = ?       Log On


   

Question 1142082: The equation of a circle is x2+y2+8x−14y+56=0 .
What is the radius of the circle?
Enter your answer in the box.
r = ?
Answer by josgarithmetic(39630) About Me  (Show Source):
You can put this solution on YOUR website!
x%5E2%2B8x%2By%5E2-14y=-56
x%5E2%2B8y%2B16%2By%5E2-14y%2B49=-56%2B16%2B49, completing the square
%28x%2B4%29%5E2%2B%28y-7%29%5E2=9
highlight%28%28x%2B4%29%5E2%2B%28y-7%29%5E2=3%5E2%29

highlight%28r=3%29