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sa se rezolve in R ecuatia(x+2)(x+1)+3=x²+2x-1

Răspuns :

x^2 +3x +2 = x^2 +2x -1
x= -3

(x+2)(x+1)+3=x² +2x-1

x²+x+2x+2+3=x² +2x-1

x²-x²+3x-2x=  -1-5

x= -6