SOLUTION: write the following equation in standard form x2 + y2 - 2x+6y - 15 = 0

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Question 595481: write the following equation in standard form
x2 + y2 - 2x+6y - 15 = 0
Answer by mamiya(56) About Me  (Show Source):
You can put this solution on YOUR website!
x2 + y2 - 2x+6y - 15 = X2 - 2X + Y2 + 6Y -15=0
= (X2 -2X +4)-4 + (Y2 +6Y +9)-9 = 0
= (X-2)^2 + (Y+3)^2 - 4 - 9 + 4 + 9= 4+9
= (X-2)^2 + (Y+3)^2 = 13
So the standard form is (X-2)^2 + (Y+3)^2 = 13