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descompuneti x patrat+4x+3

Răspuns :

x²+4x+3 = x² + x + 3x + 3 = x(x+1)+ 3(x+1) = (x+1)(x+3)


x²+4x+3 = x² + 4x + 4 -1 = (x+2)² -1² =(x+2-1)(x+2+1) = (x+1)(x+3)