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fara a rezolva ecuatia xla2-8x+12=0aflati
x1la 2+x1la2


Răspuns :

x²-8x+12=0, x²-sx+p=o, s=x₁+x₂=8. p=x₁x₂=12
x₁²+x₂²=x₁²+x₂²+2x₁x₂-2x₁x₂=(x₁+x₂)²-2x₁x₂=64-24=40