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 August 5th, 2016, 10:02 PM #1 Member   Joined: Aug 2016 From: South Korea Posts: 54 Thanks: 0 Analytic Geometry Help me guys! My answer in this general form 9x^2 + 9y^2 + 42x + 84y + 65 = 0 is (x + 21)^2 + (y +42)^2 = √2140/9 but I think it's wrong.. I don't know anymore  August 9th, 2016, 07:29 PM #2 Global Moderator   Joined: Oct 2008 From: London, Ontario, Canada - The Forest City Posts: 7,934 Thanks: 1128 Math Focus: Elementary mathematics and beyond $\displaystyle 9x^2+9y^2+42x+84y+65=0$ $\displaystyle 9x^2+42x+9y^2+84y=-65$ $\displaystyle (3x+7)^2+(3y+14)^2=-65+49+196=-65+245=180$ $\displaystyle \dfrac{(3x+7)^2}{9}+\dfrac{(3y+14)^2}{9}=\dfrac{18 0}{9}$ $\displaystyle \left(\dfrac{3x+7}{3}\right)^2+\left(\dfrac{3y+14} {3}\right)^2=20$ $\displaystyle \left(x+\dfrac73\right)^2+\left(y+\dfrac{14}{3} \right)^2=20$ Tags analytic, geometry, pre calculus Thread Tools Show Printable Version Email this Page Display Modes Linear Mode Switch to Hybrid Mode Switch to Threaded Mode Similar Threads Thread Thread Starter Forum Replies Last Post tkttan Geometry 6 June 14th, 2014 07:03 AM Geometry 1 December 15th, 2012 08:36 AM Rayne Geometry 4 November 2nd, 2010 12:47 PM nortpron Geometry 12 April 6th, 2010 10:12 AM nortpron Geometry 6 April 5th, 2010 01:07 AM

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