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D( x )
5*x^3 = 0
5*x^3 = 0
5*x^3 = 0
5*x^3 = 0 // : 5
x^3 = 0
x = 0
x in (-oo:0) U (0:+oo)
(5*x^3-(10*x))/(5*x^3) = 0
(5*x^3-10*x)/(5*x^3) = 0
5*x^3-10*x = 0
5*x*(x^2-2) = 0
1*x^2 = 2 // : 1
x^2 = 2
x^2 = 2 // ^ 1/2
abs(x) = 2^(1/2)
x = 2^(1/2) or x = -2^(1/2)
5*x*(x-2^(1/2))*(x+2^(1/2)) = 0
(5*x*(x-2^(1/2))*(x+2^(1/2)))/(5*x^3) = 0
( 5*x )
5*x = 0 // : 5
x = 0
( x+2^(1/2) )
x+2^(1/2) = 0 // - 2^(1/2)
x = -2^(1/2)
( x-2^(1/2) )
x-2^(1/2) = 0 // + 2^(1/2)
x = 2^(1/2)
x in { 0}
x in { -2^(1/2), 2^(1/2) }
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