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D( x )
x < 0
x < 0
x in <0:+oo)
2*(10^(1/2)-1)*x^(1/2) = 9 // - 9
2*(10^(1/2)-1)*x^(1/2)-9 = 0
2*(10^(1/2)-1)*x^(1/2) = 9 // : 2*(10^(1/2)-1)
x^(1/2) = 9/(2*(10^(1/2)-1))
x^(1/2) = 9/(2*(10^(1/2)-1)) // ^ 2
x = 81/(4*(10^(1/2)-1)^2)
x = 81/(4*(10^(1/2)-1)^2)
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