How do I find the length of the segment AB when A(-4,6) and B(3,-5)

Distance between 2 points is:

L=sqroot((x2-x1)^2+(y2-y1)^2)
Heare:
x1=-4 y1=6
x2=3 y2=-5
L=sqroot((3-(-4))^2+(-5-6)^2)
=sqroot((3+4)^2+(-11)^2)
=sqroot(7^2+(-11)^2)
=sqrot(49+121)
=sqroot(170)