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24=[tex] x^{2} [/tex]+2x
Aflati numarul x.


Răspuns :

24=x²+2x
x²+2x-24=0
Δ=2²+4×24=4+96=100
x₁=(-2+√100)/2=(-2+10)/2=4
x₂=(-2-√100)/2=(-2-10)/2=-6