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Descompuneti :
a ) E(x)= x^4 -1


Răspuns :

[tex] x^{4} -1[/tex][tex]=( x^{2} -1) (x^{2} +1)= (x-1)(x+1) ( x^{2} +1)[/tex]

[tex] x^{6}-1 = ( x^{3}-1 ) ( x^{3}+1 ) = (x-1)( x^{2} +x+1) (x+1)( x^{2} -x+1)[/tex]