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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
8/x-16 = (16/3)*x // - (16/3)*x
8/x-((16/3)*x)-16 = 0
(-16/3)*x+8/x-16 = 0
8*x^-1-16/3*x^1-16*x^0 = 0
(8*x^0-16/3*x^2-16*x^1)/(x^1) = 0 // * x^2
x^1*(8*x^0-16/3*x^2-16*x^1) = 0
x^1
(-16/3)*x^2-16*x+8 = 0
(-16/3)*x^2-16*x+8 = 0
DELTA = (-16)^2-(4*8*(-16/3))
DELTA = 1280/3
DELTA > 0
x = ((1280/3)^(1/2)+16)/(2*(-16/3)) or x = (16-(1280/3)^(1/2))/(2*(-16/3))
x = -3/32*((1280/3)^(1/2)+16) or x = -3/32*(16-(1280/3)^(1/2))
x in { -3/32*((1280/3)^(1/2)+16), -3/32*(16-(1280/3)^(1/2))}
x in { -3/32*((1280/3)^(1/2)+16), -3/32*(16-(1280/3)^(1/2)) }
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