Question 1181483
This is an equation:  {{{5x^3-6x^2=4x-5}}}


{{{5x^3-6x^2-4x+5=0}}}----------this is a polynomial, from the given equation.


Dividing it by x+1 is same as checking for "root" of {{{-1}}}.  (You could use synthetic division.)
<pre>
-1  |  5   -6   -4   5
    |     -5     11  -7
    |______________________
       5  -11    7    {{{highlight(-2)}}}
</pre>