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x² < 1-x
x²-x-1<0
a=1 b=-1 c=-1
Δ=b²-4ac
Δ= 1+4
Δ=5
√Δ=√5
Δ≡√5
x₁=-b+Δ / 2a
x₁=1+√5 /2
x₁=1+2,23 /2 =1,615
x₂=-b-Δ / 2a
x₂=1-√5 /2
x₂=1-2,23 /2 =-0.615