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3x+7-2xpatrat+(5x-xpatrat+2)-(3xpatrat-4x+5)+
si descompuneti:
xpatrat+2x+1-zpatrat+


Răspuns :

3x+7-2x²+5x-+2-3x²+4x-5= - 6x²+12x+4 ;

x² + 2x + 1 - z² = (x+1)²-z² = (x+1-z)(x+1+z) ;