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I think you are going to find that is irreducible in Q and therefore in Z.
What do you get if you multiply out the brackets and simplfy?
How about this one? What are the factors of:
You can simplify the problem by making the substitution
Then it becomes
I notice that x = -1 makes this expression zero, so by the factor theorem (x + 1) is a factor.
From there you can easily get the quadratic that goes with this and you'll find the formula will give another two factors.
Then you can go back to the m expression from there.
Pls factor completely: (m^9)-(3•m^3)-2