Question

Find the distance between the points $A(-2,1,-3)$ and $B(4,3,-6)$.

Answer 1

We have

$AB=\sqrt{(4-(-2){)}^2+(3-1{)}^2+(-6-(-3){)}^2}$

$=\sqrt{(6^2+2^2+(-3{)}^2)}=\sqrt{49}=7\text{units}$