If the radius of the circle x2+y2+ 8x + 10y + k = 0 is 7, Then k =
-7
7
-8
8
radius=7⇒√16+25−K=7⇒41−K=49⇒K=−8
Find the cente and radius of the following circle. x2+y2−8x−10y−12=0