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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/x = (1*x)/6 // - (1*x)/6
5/x-((1*x)/6) = 0
5/x-(x/6) = 0
5*x^-1-1/6*x^1 = 0
(5*x^0-1/6*x^2)/(x^1) = 0 // * x^2
x^1*(5*x^0-1/6*x^2) = 0
x^1
(-1/6)*x^2+5 = 0
(-1/6)*x^2+5 = 0
DELTA = 0^2-(4*5*(-1/6))
DELTA = 10/3
DELTA > 0
x = ((10/3)^(1/2)+0)/(2*(-1/6)) or x = (0-(10/3)^(1/2))/(2*(-1/6))
x = -3*(10/3)^(1/2) or x = 3*(10/3)^(1/2)
x in { -3*(10/3)^(1/2), 3*(10/3)^(1/2)}
x in { -3*(10/3)^(1/2), 3*(10/3)^(1/2) }
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