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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/x-((2/5)*x)-10 = 0
(-2/5)*x+2/x-10 = 0
2*x^-1-2/5*x^1-10*x^0 = 0
(2*x^0-2/5*x^2-10*x^1)/(x^1) = 0 // * x^2
x^1*(2*x^0-2/5*x^2-10*x^1) = 0
x^1
(-2/5)*x^2-10*x+2 = 0
(-2/5)*x^2-10*x+2 = 0
DELTA = (-10)^2-(2*4*(-2/5))
DELTA = 516/5
DELTA > 0
x = ((516/5)^(1/2)+10)/(2*(-2/5)) or x = (10-(516/5)^(1/2))/(2*(-2/5))
x = -5/4*((516/5)^(1/2)+10) or x = -5/4*(10-(516/5)^(1/2))
x in { -5/4*((516/5)^(1/2)+10), -5/4*(10-(516/5)^(1/2))}
x in { -5/4*((516/5)^(1/2)+10), -5/4*(10-(516/5)^(1/2)) }
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