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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(4*x)/5 = 8/x // - 8/x
(4*x)/5-(8/x) = 0
(4*x)/5-8*x^-1 = 0
4/5*x^1-8*x^-1 = 0
(4/5*x^2-8*x^0)/(x^1) = 0 // * x^2
x^1*(4/5*x^2-8*x^0) = 0
x^1
(4/5)*x^2-8 = 0
(4/5)*x^2-8 = 0
DELTA = 0^2-(-8*4*(4/5))
DELTA = 128/5
DELTA > 0
x = ((128/5)^(1/2)+0)/(2*(4/5)) or x = (0-(128/5)^(1/2))/(2*(4/5))
x = 5/8*(128/5)^(1/2) or x = 5/8*(128/5)^(1/2)
x in { 5/8*(128/5)^(1/2), 5/8*(128/5)^(1/2)}
x in { 5/8*(128/5)^(1/2), 5/8*(128/5)^(1/2) }
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