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cum fac : x la a 5 +x la a 3 -x la a 2 -1

Răspuns :

[tex] x^{5} + x^{3} - x^{2} -1= x^{3}( x^{2} +1)-( x^{2} +1) = (x^{3} -1)( x^{2} +1) [/tex]