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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x+8/x-625 = 0
1*x^1+8*x^-1-625*x^0 = 0
(1*x^2-625*x^1+8*x^0)/(x^1) = 0 // * x^2
x^1*(1*x^2-625*x^1+8*x^0) = 0
x^1
x^2-625*x+8 = 0
x^2-625*x+8 = 0
DELTA = (-625)^2-(1*4*8)
DELTA = 390593
DELTA > 0
x = (390593^(1/2)+625)/(1*2) or x = (625-390593^(1/2))/(1*2)
x = (390593^(1/2)+625)/2 or x = (625-390593^(1/2))/2
x in { (625-390593^(1/2))/2, (390593^(1/2)+625)/2}
x in { (625-390593^(1/2))/2, (390593^(1/2)+625)/2 }
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