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Descompuneti in factori ireductibili in K[X]:

1. [tex]f = X^{2}-4, K = Q[/tex]
2. [tex]f=3X^{2} -4X+1, K=Q[/tex]
3. [tex]f=X^{4}+X^{2}+1, K=Q[/tex]
4.[tex]f=X^{3}-X^{2}-X+1, K=R[/tex]
5.[tex]f=X^{3} +3X^{2} -2x-6, K=Q[/tex]