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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
64/x = 2*x-8 // - 2*x-8
64/x-(2*x)+8 = 0
64/x-2*x+8 = 0
64*x^-1-2*x^1+8*x^0 = 0
(8*x^1-2*x^2+64*x^0)/(x^1) = 0 // * x^2
x^1*(8*x^1-2*x^2+64*x^0) = 0
x^1
8*x-2*x^2+64 = 0
8*x-2*x^2+64 = 0
DELTA = 8^2-(-2*4*64)
DELTA = 576
DELTA > 0
x = (576^(1/2)-8)/(-2*2) or x = (-576^(1/2)-8)/(-2*2)
x = -4 or x = 8
x in { -4, 8}
x in { -4, 8 }
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