Answer
$2 \sqrt 6$
Work Step by Step
The distance $d$ between two points $P_1(x_1,y_1,z_1)$ and $P_2(x_2,y_2,z_2)$ can be calculated as:
$d=\sqrt{(x_2-x_1)^2+(y_2-y_1)^2+(z_2-z_1)^2}$.
Here, we have:
$d=\sqrt{(4-2)^2+(1-(-3))^2+(-1-(-3)))^2}\\
=\sqrt{(2)^2+(4)^2+(2)^2}\\=\sqrt {4+16+4}\\
=\sqrt{24}\\=2 \sqrt 6$
