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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
10/x = (1/2)*x+1 // - (1/2)*x+1
10/x-((1/2)*x)-1 = 0
(-1/2)*x+10/x-1 = 0
10*x^-1-1/2*x^1-1*x^0 = 0
(10*x^0-1/2*x^2-1*x^1)/(x^1) = 0 // * x^2
x^1*(10*x^0-1/2*x^2-1*x^1) = 0
x^1
(-1/2)*x^2-x+10 = 0
(-1/2)*x^2-x+10 = 0
DELTA = (-1)^2-(4*10*(-1/2))
DELTA = 21
DELTA > 0
x = (21^(1/2)+1)/(2*(-1/2)) or x = (1-21^(1/2))/(2*(-1/2))
x = -(21^(1/2)+1) or x = 21^(1/2)-1
x in { -(21^(1/2)+1), 21^(1/2)-1}
x in { -(21^(1/2)+1), 21^(1/2)-1 }
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