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D( x )
4*x^3 = 0
4*x^3 = 0
4*x^3 = 0
4*x^3 = 0 // : 4
x^3 = 0
x = 0
x in (-oo:0) U (0:+oo)
(24*x^6-(16*x^4))/(4*x^3) = 0
(24*x^6-16*x^4)/(4*x^3) = 0
24*x^6-16*x^4 = 0
8*x^4*(3*x^2-2) = 0
3*x^2 = 2 // : 3
x^2 = 2/3
x^2 = 2/3 // ^ 1/2
abs(x) = (2/3)^(1/2)
x = (2/3)^(1/2) or x = -(2/3)^(1/2)
8*x^4*(x-(2/3)^(1/2))*(x+(2/3)^(1/2)) = 0
(8*x^4*(x-(2/3)^(1/2))*(x+(2/3)^(1/2)))/(4*x^3) = 0
( 8*x^4 )
8*x^4 = 0 // : 8
x^4 = 0
x = 0
( x+(2/3)^(1/2) )
x+(2/3)^(1/2) = 0 // - (2/3)^(1/2)
x = -(2/3)^(1/2)
( x-(2/3)^(1/2) )
x-(2/3)^(1/2) = 0 // + (2/3)^(1/2)
x = (2/3)^(1/2)
x in { 0}
x in { -(2/3)^(1/2), (2/3)^(1/2) }
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