Can someone tell me if this is right?

The equation of CirclePisx2 +y2 − 6x+ 4y= 21 and the equation of circleQisx2 +y2 − 8x+ 10y= 11. What is the distance between the centers of these circles?

Circle p

(x-6)2+(y+4)2=21

x2+36+y2+16=21

x2+y2=21-36-16=-31

x2+y2=-31squared

Circle Q

x2+y2-8x+10y=11

(x-8)2+(y+10)2=11

x2+64+42+100=11

x2+y2=11-164=-153

answer -153-31=122 is the difference?