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t⁴+3t²-4=0
t⁴-t²+4t²-4=0
t²(t²-1)+4(t²-1)=0
(t²-1)(t²+4)=0
t²+4 nie ma m.z.
t²-1=0
t=-1 v t=1
log₂(x-1)=-1 v log₂(x-1)=1
log₂(x-1)=log₂1/2 v log₂(x-1)=2
x-1=1/2 v x-1=2
x=1¹/₂ v x=3