Chapter 11 - Section 11.1 - Three-Dimensional Coordinate Systems - Exercises - Page 600: 46

$\sqrt{38}$

Let $A=(5,3,-2)$ and $B=(0,0,0)$ be the two given points. The distance between two points can be calculated as: $|AB|=\sqrt{(x-x_0)^2+(y-y_0)^2+(z-z_0)^2}$ Thus, we have $|AB|=\sqrt{(0-5)^2+(0-3)^2+(0-(-2))^2}=\sqrt {25+9+4}=\sqrt{38}$