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D( x )
3*x+1 = 0
3*x+1 = 0
3*x+1 = 0
3*x+1 = 0 // - 1
3*x = -1 // : 3
x = -1/3
x in (-oo:-1/3) U (-1/3:+oo)
(12*x^5+4*x^4-(24*x^2)-(8*x))/(3*x+1) = 0
(12*x^5+4*x^4-24*x^2-8*x)/(3*x+1) = 0
12*x^5+4*x^4-24*x^2-8*x = 0
4*x*(3*x^4+x^3-6*x-2) = 0
3*x^4+x^3-6*x-2
x^3*(3*x+1)-6*x-2
x^3*(3*x+1)-2*(3*x+1)
(x^3-2)*(3*x+1)
4*x*(x^3-2)*(3*x+1) = 0
4*x*(x^3-2) = 0
( 4*x )
4*x = 0 // : 4
x = 0
( x^3-2 )
1*x^3 = 2 // : 1
x^3 = 2
x^3 = 2 // ^ 1/3
x = 2^(1/3)
x in { 0, 2^(1/3) }
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