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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
21.56/x-(2.62*x) = 0
21.56/x-2.62*x = 0
21.56*x^-1-2.62*x = 0
x^-1*(21.56-2.62*x^2) = 0
-2.62*x^2 = -21.56 // : -2.62
x^2 = 8.22900763
x^2 = 8.22900763 // ^ 1/2
abs(x) = 8.22900763^(1/2)
x = 8.22900763^(1/2) or x = -8.22900763^(1/2)
1/x = 0
1*x^-1 = 0 // : 1
x^-1 = 0
x należy do O
x in { 8.22900763^(1/2), -8.22900763^(1/2) }
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