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D( x )
4*x = 0
4*x = 0
4*x = 0
4*x = 0 // : 4
x = 0
x in (-oo:0) U (0:+oo)
(28*x^8-(24*x^6))/(4*x) = 0
(28*x^8-24*x^6)/(4*x) = 0
28*x^8-24*x^6 = 0
4*x^6*(7*x^2-6) = 0
7*x^2 = 6 // : 7
x^2 = 6/7
x^2 = 6/7 // ^ 1/2
abs(x) = (6/7)^(1/2)
x = (6/7)^(1/2) or x = -(6/7)^(1/2)
4*x^6*(x-(6/7)^(1/2))*(x+(6/7)^(1/2)) = 0
(4*x^6*(x-(6/7)^(1/2))*(x+(6/7)^(1/2)))/(4*x) = 0
( 4*x^6 )
4*x^6 = 0 // : 4
x^6 = 0
x = 0
( x+(6/7)^(1/2) )
x+(6/7)^(1/2) = 0 // - (6/7)^(1/2)
x = -(6/7)^(1/2)
( x-(6/7)^(1/2) )
x-(6/7)^(1/2) = 0 // + (6/7)^(1/2)
x = (6/7)^(1/2)
x in { 0}
x in { -(6/7)^(1/2), (6/7)^(1/2) }
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