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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/x-((4/5)*x) = 1 // - 1
1/x-((4/5)*x)-1 = 0
(-4/5)*x+1/x-1 = 0
1*x^-1-4/5*x^1-1*x^0 = 0
(1*x^0-4/5*x^2-1*x^1)/(x^1) = 0 // * x^2
x^1*(1*x^0-4/5*x^2-1*x^1) = 0
x^1
(-4/5)*x^2-x+1 = 0
(-4/5)*x^2-x+1 = 0
DELTA = (-1)^2-(1*4*(-4/5))
DELTA = 21/5
DELTA > 0
x = ((21/5)^(1/2)+1)/(2*(-4/5)) or x = (1-(21/5)^(1/2))/(2*(-4/5))
x = -5/8*((21/5)^(1/2)+1) or x = -5/8*(1-(21/5)^(1/2))
x in { -5/8*((21/5)^(1/2)+1), -5/8*(1-(21/5)^(1/2))}
x in { -5/8*((21/5)^(1/2)+1), -5/8*(1-(21/5)^(1/2)) }
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