Answer :
Let:
(3,8) = (x1,y1)
(5,-1) = (x2,y2)
Using the distance formula:
[tex]\begin{gathered} d=\sqrt[]{(x2-x1)^2+(y2-y1)^2} \\ d=\sqrt[]{(5-3)^2+(-1-8)^2} \\ d=\sqrt[]{2^2+(-9)^2}=\sqrt[]{85} \end{gathered}[/tex]Let:
(3,8) = (x1,y1)
(5,-1) = (x2,y2)
Using the distance formula:
[tex]\begin{gathered} d=\sqrt[]{(x2-x1)^2+(y2-y1)^2} \\ d=\sqrt[]{(5-3)^2+(-1-8)^2} \\ d=\sqrt[]{2^2+(-9)^2}=\sqrt[]{85} \end{gathered}[/tex]