Find the radius of the circle given by x^2-10x+y^2+8y=18
x^2 -10x + y^2 + 8y = 18 complete the square on x, y
x^2 -10x + 25 + y^2 + 8y + 16 = 18 + 25 + 16
(x - 5)^2 + (y + 4)^2 = 59
The radius = sqrt (59) units
WAIT HOW IS THAT POSSIBLE. I got 56 because I got 18+ 25 + 13
We're adding 18 + 25 + 16 = 59
The radius = sqrt (59)
