Find the distandlce between the two points (4, 8) and (0, 5). simplify completely.

and can someone explain how to do this ?

distance betweeen 2 points, (x1,y1) and (x2,y2) is D=√[(x2-x1)²+(y1-y1)²]
given (4,8) and (0,5),
x1=4, y1=8, x2=0, y2=5
D=√[(0-4)²+(5-8)²]
D=√[(-4)²+(-3)²]
D=√[16+9]
D=√25
D=5
the distance between the point is 5 units