Question 1127820
.
<pre>
The simplest way to solve the problem and to answer the question is <U>TO IGNORE THEIR INSTRUCTION</U> about using 
the Rational Root theorem, and to factor the given polynomial using the grouping method


    {{{2x^3 + x^2 - 8x - 4}}} = {{{(2x^3-8x)}}} + {{{(x^2-4)}}} = {{{2x*(x^2-4)}}} + {{{(x^2-4)}}} = {{{(x^2-4)*(2x+1)}}} = (x-2)*(x+2)*(2x+1).


Thus the correct answers are  these and only these  A),  C), and  D).
</pre>

--------------


<pre>
I am &nbsp;129% &nbsp;sure that the original problem &nbsp;(without their instruction on using Rational Root theorem) 

was designed and intended to be solved exactly in this way, &nbsp;and only later, &nbsp;in its journey over the Internet, 

this addition was mistakenly made about using the Rational Root theorem.
</pre>