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X la puterea 2 -14x-11=0

Răspuns :

x²-14x-11=0
Δ=(-14)²-4×1×(-11)=196+44=240
x₁=[-(-14)+√240]//2=(14+4√15)/2=7+2√15
x₂=[-(-14)-√240]//2=(14-4√15)/2=7-2√15