Find the Values Of $x$ For Which the Expression Is Real $\overline{\sqrt{\left(x^{2}-3 x+2\right)\left(x^{2}-x-2\right)}}$

Short Answer

Find the values of $x$ for which the expression is real:
$\overline{\sqrt{\left(x^{2}-3 x+2\right)\left(x^{2}-x-2\right)}}$