SOLUTION: Please help me find the x and y intercept for a circle,and if you can the center point and radius: {{{x^2+y^2+4x+2y-20=0}}}

Algebra ->  Quadratic Equations and Parabolas  -> Quadratic Equations Lessons  -> Quadratic Equation Lesson -> SOLUTION: Please help me find the x and y intercept for a circle,and if you can the center point and radius: {{{x^2+y^2+4x+2y-20=0}}}       Log On


   

Question 340182: Please help me find the x and y intercept for a circle,and if you can the center point and radius:
x%5E2%2By%5E2%2B4x%2B2y-20=0
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Complete the square in x and y.
x%5E2%2By%5E2%2B4x%2B2y-20=0
x%5E2%2B4x%2By%5E2%2B2y-20=0
x%5E2%2B4x%2B4%2By%5E2%2B2y%2B1-20=4%2B1
%28x%2B2%29%5E2%2B%28y%2B1%29%5E2=25
Compare to the equation of a circle centered at (h,k) with radius R.
%28x-h%29%5E2%2B%28y-k%29%5E2=R%5E2