[tex]5\sqrt{2}[/tex]
Please refer to my Answer from these Questions to know more about the Distance Formula:
Solving for the distance between the points, [tex](-1, -3)[/tex] and [tex](4,2)[/tex]:
[tex]\sqrt{(4 -(-1))^2 +(2 -(-3))^2} \\ \sqrt{(4 +1)^2 +(2 +3)^2} \\ \sqrt{5^2 +5^2} \\ \sqrt{25 +25} \\ \sqrt{50} \\ \sqrt{25 \cdot 2} \\ 5\sqrt{2}[/tex]