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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
7/x = (1/2)*x+26 // - (1/2)*x+26
7/x-((1/2)*x)-26 = 0
(-1/2)*x+7/x-26 = 0
7*x^-1-1/2*x^1-26*x^0 = 0
(7*x^0-1/2*x^2-26*x^1)/(x^1) = 0 // * x^2
x^1*(7*x^0-1/2*x^2-26*x^1) = 0
x^1
(-1/2)*x^2-26*x+7 = 0
(-1/2)*x^2-26*x+7 = 0
DELTA = (-26)^2-(4*7*(-1/2))
DELTA = 690
DELTA > 0
x = (690^(1/2)+26)/(2*(-1/2)) or x = (26-690^(1/2))/(2*(-1/2))
x = -(690^(1/2)+26) or x = 690^(1/2)-26
x in { -(690^(1/2)+26), 690^(1/2)-26}
x in { -(690^(1/2)+26), 690^(1/2)-26 }
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