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descompuneti in factori (x+1)²-9

Răspuns :

[(x+1)+3][(x+1)-3]=(x+1+3)(x+1-3)=(x+4)(x-2)
Se foloseste formula: (a^2-b^2= ... 
adica: *x+1)^2-3^2=(x+1+3)(x+1-3)=(x+4)(x-2)