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Find the radius of the circle with equation 9x^2 - 18x + 9y^2 + 36y + 88 = 0.

 Jul 26, 2021
 #1
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+2

re-arrange....and divide through by 9 to get

x^2 - 2x      + y^2+4y    = - 88/9              complete the square for x and y

(x-1)^1       + (y+2)^2   = - 88/ 9  +1 + 4       the red total = r ^2      

                    You can finish? (probably not....there is something wrong with the equation in your Q!....Are you sure it is +88 and not -88?)

 Jul 26, 2021

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