The moment of force F=$\hat{i}+\hat{j}+\hat{k}$ acting at points (- 2,3, 4) about point (1, 2, 3) is

r =r₁ -r₂
=(- 2$\hat{i}$+3$\hat{j}$ + 4$\hat{k}$) -($\hat{i}$+2$\hat{j}$ + 3$\hat{k}$)
=-3$\hat{i}$+$\hat{j}$+$\hat{k}$
Moment of the force = r x F
$=\left|\begin{array}{ccc}\mathrm{i}& \mathrm{j}& \mathrm{k}\\ -3& 1& 1\\ 1& 1& 1\end{array}\right|$ 
= $\hat{i}$(1 -1) + $\hat{j}$ (1 + 3) + $\hat{k}$ (-3 -1)
=8j-4k- 4(j-k)