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Descompuneti in factori expresia 
E    =2x²+x-6
  (x)


Răspuns :

E(x) = 2(x² +4x+4) - 7x -14 =2(x+2)² - 7(x+2) = (x+2)[2(x+2) - 7] = (x+2)(2x-3)