Question 886717
The expression you show does not look as to correspond to anything on page 8 of your 22 page document.  What is found <-deleted-> to factorize.  Here goes the process anyway.


The expression actually shown there is this:
{{{highlight_green(x^-1-3^x-2+2x^-3)}}}

which goes like this...
{{{1/x-3/x^2+2/x^3}}}
<s>and the instruction to factor 1/x^3 seems wrong...</s>
{{{(1/x)(1-3/x+2/x^2)}}}
and you should want to simplify this, maybe;
{{{(1/x)(x^2/x^2-3x/x^2+2/x^2)}}}
{{{(1/x)(x^2-3x+2)/x^2}}}
{{{(1/x^3)(x^2-3x+2)}}}
{{{(1/x^3)(x-1)(x-2)}}}
{{{highlight(x^(-3)(x-1)(x-2))}}}