SOLUTION: I am working on algebra homework. I have tried this problem several times and am missing something. Write an equation in general form of a circle with the given properties Ce

Algebra ->  Graphs -> SOLUTION: I am working on algebra homework. I have tried this problem several times and am missing something. Write an equation in general form of a circle with the given properties Ce      Log On


   

Question 577653: I am working on algebra homework. I have tried this problem several times and am missing something.
Write an equation in general form of a circle with the given properties
Center at (-2,7); r=8 sqrt (5)
my answer was x^2 + y^2 + 4x - 14y - 267 = 0 marked incorrect
i tried a different equation and got it right. I dont know where I am making a mistake. Here is the one I tried and got correct but will not get credit for.
(-9,3); r=4 sqrt (2)
answer x^2 + y^2 +18x - 6y + 58 = 0
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
Write an equation in general form of a circle with the given properties
Center at (-2,7); r=8 sqrt (5)
------------------
%28x%2B2%29%5E2+%2B+%28y-7%29%5E2+=+64%2A5
x%5E2+%2B+4x+%2B+4+%2B+y%5E2+-+14y+%2B+49+=+320
x%5E2+%2B+4x+%2B+y%5E2+-+14y+-+267+=+0
-----------------------
Looks right to me.
-------------------------
my answer was x^2 + y^2 + 4x - 14y - 267 = 0 marked incorrect
i tried a different equation and got it right. I dont know where I am making a mistake. Here is the one I tried and got correct but will not get credit for.
(-9,3); r=4 sqrt (2)
answer x^2 + y^2 +18x - 6y + 58 = 0