x2-x-2=0

x^2-x-2=0 delta=1-4*1*(-2)=1+8=9 pierw. z delta=3 x1=1-3/2=-2/2=-1 x2=1+3/2=4/2=2 odp x1=-1 x2=2

Δ=b²-4ac=1+8=9 √Δ=3 x₁=-b-√Δ/2a=1-3/2=-2/2=-1 x₂=-b+√Δ/2a=1+3/2=4/2=2