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D( x )
(x-4)^2 = 0
x = 0
(x-4)^2 = 0
(x-4)^2 = 0
x-4 = 0 // + 4
x = 4
x = 0
x = 0
x in (-oo:0) U (0:4) U (4:+oo)
(5*x^-20*x)/((x-4)^2) = 0
(5*x^-19)/((x-4)^2) = 0
5*x^-19 = 0 // : 5
x^-19 = 0
x naleu017Cy do O
x belongs to the empty set
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