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Δ=b²-4ac
Δ=0²-4*1*(-1)
Δ=0+4
Δ=4 √Δ=2
x1=-b-√Δ/2a
x2=-b+√Δ/2a
x^2-1<0 dla
x∈(-1;1)
proszę:-)
x2=1 / pierwiastek
x=1 lub x=-1