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zadanie 2
x²-x-2>0
Δ=1+8=9
√Δ=3
x1=-2
x2=1
x∈u
zadanie 3
a)
3(x-2)=4(x+5)
3x-6=4x+20
x=-26
b)
Δ=4-12
Δ<0 brak miejsc zerowych
x∈Ф
c)
x²+4x+4=x²+2
4x=-2
x=-0,5