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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
8*x-(5/x) > 0
8*x-5*x^-1 > 0
8*x-5*x^-1 = 0
x^-1*(8*x^2-5) = 0
8*x^2 = 5 // : 8
x^2 = 5/8
x^2 = 5/8 // ^ 1/2
abs(x) = (5/8)^(1/2)
x = (5/8)^(1/2) or x = -(5/8)^(1/2)
1/x = 0
1*x^-1 = 0 // : 1
x^-1 = 0
x należy do O
(x-(5/8)^(1/2))*(x+(5/8)^(1/2)) > 0
(-oo:-(5/8)^(1/2)) (-(5/8)^(1/2):(5/8)^(1/2)) ((5/8)^(1/2):+oo) x-(5/8)^(1/2) - - + x+(5/8)^(1/2) - + +
x in (-oo:-(5/8)^(1/2)) U ((5/8)^(1/2):+oo)
(-oo:-(5/8)^(1/2)) U ((5/8)^(1/2):+oo)
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