Imma need more information on this?
Oof I’m not quite sure how to do that
The answer would be 7-x=x
The process is similar to (and easier* than) adding three 4-digit numbers. Add the numbers in each column.
The sum is ...
(2+1-3)x³ +(-4+6+2)x² +(6-8-4)x +(-3+12-7)
= 0x³ +4x² -6x +2
The sum is 4x² -6x +2
_____
* The process is easier because there are no "carry" operations from one column to another as there may be when adding multi-digit numbers.
Answer:
The polynomial is:

Step-by-step explanation:
A third degree polynomial can be written in function of it's zeros
the following way:

In which a is the leading coefficient.
Integer coefficient that have zeros: 1+2i, 1-2i, -4
Leading coefficient: 1
So




Since 



