|
Question 434811: center and radius of x^2 +y^2-18x+8y+81=0 please
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! center and radius of x^2 +y^2-18x+8y+81=0 please
Complete the square on the x-terms and on the y-terms:
--------
x^2-18x+81 + y^2+8y+16 = -81+81+16
--------------------------------------
(x-9)^2 + (y+4)^2 = 16
----
Center at (9,-4)
Radius = sqrt(16) = 4
=========================
Cheers,
Stan H.
==========
|
|
|
| |
