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D( x )
4*x^-3*x+8 = 0
x = 0
4*x^-3*x+8 = 0
4*x^-3*x+8 = 0
4*x^-2 = -8 // : 4
x^-2 = -2
-2 < 0
1/(x^2) = -2 // * x^2
1 = -2*x^2 // : -2
-1/2 = x^2
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(6*x+2)/(4*x^-3*x+8) = 0
(6*x+2)/(4*x^-2+8) = 0
6*x+2 = 0 // - 2
6*x = -2 // : 6
x = -2/6
x = -1/3
x = -1/3
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