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Dr: x>=0 //dziedzina rownania
logx = - log(x+1)
logx = log(x+1)⁻¹
z roznowartosciowości f. log.
x = (x+1)⁻¹
x= 1/(x+1) /*(x+1)
x(x+1)=1
x²+x-1=0
Δ=1+4=5
√Δ = √5
x1 = (-1 + √5)/2
x2 = (-1 - √5)/2
x2 ∉ Dr
Odp. x = (-1 + √5)/2