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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
10/x-(2*x)+8 = 0
10/x-2*x+8 = 0
10*x^-1-2*x^1+8*x^0 = 0
(8*x^1-2*x^2+10*x^0)/(x^1) = 0 // * x^2
x^1*(8*x^1-2*x^2+10*x^0) = 0
x^1
8*x-2*x^2+10 = 0
8*x-2*x^2+10 = 0
DELTA = 8^2-(-2*4*10)
DELTA = 144
DELTA > 0
x = (144^(1/2)-8)/(-2*2) or x = (-144^(1/2)-8)/(-2*2)
x = -1 or x = 5
x in { -1, 5}
x in { -1, 5 }
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