Using the binomial theorem:











and since we are given ,





Let , which is what we want to find.



Feasible rational roots are ±1, ±2
Using synthetic division we find that -1 is a solution

-1|1  0 -3 -2
  |  -1  1  2
   1 -1 -2  0

Thus we have factored



as



Factoring further:



Thus the solutions are y = -1, y = 2

so  is either -1 or 2.

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Something is missing from this one that must be given 
to find a solution.  Check the problem again and repost 
it with the part that's missing here.

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Multiplying the first two factors:



Multiplying the first two factors:



Multiplying the first two factors:



Multiplying those factors:



Let 



Clear of fractions:





Factoring,



Solutions are , 

and since 

 or 

(In the case of the second negative solution, 
x would have to be imaginary).

Edwin