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D( x )
2*x-8 = 0
2*x-8 = 0
2*x-8 = 0
2*x-8 = 0 // + 8
2*x = 8 // : 2
x = 8/2
x = 4
x in (-oo:4) U (4:+oo)
(x^2-(8*x)+16)/(2*x-8) = 0
(x^2-8*x+16)/(2*x-8) = 0
x^2-8*x+16 = 0
x^2-8*x+16 = 0
DELTA = (-8)^2-(1*4*16)
DELTA = 0
x = 8/(1*2)
x = 4 or x = 4
(x-4)^2 = 0
((x-4)^2)/(2*x-8) = 0
x-4 = 0 // + 4
x = 4
x in { 4}
x belongs to the empty set
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