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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4*x+8/x-5 = 8 // - 8
4*x+8/x-8-5 = 0
4*x^1+8*x^-1-13*x^0 = 0
(4*x^2-13*x^1+8*x^0)/(x^1) = 0 // * x^2
x^1*(4*x^2-13*x^1+8*x^0) = 0
x^1
4*x^2-13*x+8 = 0
4*x^2-13*x+8 = 0
DELTA = (-13)^2-(4*4*8)
DELTA = 41
DELTA > 0
x = (41^(1/2)+13)/(2*4) or x = (13-41^(1/2))/(2*4)
x = (41^(1/2)+13)/8 or x = (13-41^(1/2))/8
x in { (13-41^(1/2))/8, (41^(1/2)+13)/8}
x in { (13-41^(1/2))/8, (41^(1/2)+13)/8 }
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