Cirle formula
(x-h)^2 + (y-k)^2 = r^2 center = h,k
( x+5)^2 + (y-2)^2 =r^2
x^2 + 10x + 25 + y^2 -4y + 4 = r^2
x^2 + y^2 + 10x -4y = r^2 -29 Multiply both sides by 2 to get the 2y^2
2 x^2 + 2y^2 + 20x - 8y = 2r^2 - 58 and 2^r^2 - 58 = 40 2r^2 = 98 r^2 = 49 r= 7
A+B + C +4 = 2 + 20 + (-8) + 4 = 18
IF you meant A+B+C+r then = 2+20+(-8) + 7 = 21