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x la a doua - x - 6
repede va rogggg


Răspuns :

[tex]x^2-x-6=0 \\ \bigtriangleup=1+24=25 \\ x_{1}= \frac{1+5}{2} =6 \\ \\ x_{2}= \frac{1-5}{2} =-2 \\ \\ [/tex]