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

Guest Jul 26, 2021

#1**+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?)

ElectricPavlov Jul 26, 2021