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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
14/x = (7/2)*x-5 // - (7/2)*x-5
14/x-((7/2)*x)+5 = 0
(-7/2)*x+14/x+5 = 0
14*x^-1-7/2*x^1+5*x^0 = 0
(5*x^1-7/2*x^2+14*x^0)/(x^1) = 0 // * x^2
x^1*(5*x^1-7/2*x^2+14*x^0) = 0
x^1
(-7/2)*x^2+5*x+14 = 0
(-7/2)*x^2+5*x+14 = 0
DELTA = 5^2-(4*14*(-7/2))
DELTA = 221
DELTA > 0
x = (221^(1/2)-5)/(2*(-7/2)) or x = (-221^(1/2)-5)/(2*(-7/2))
x = (221^(1/2)-5)/(-7) or x = (221^(1/2)+5)/7
x in { (221^(1/2)-5)/(-7), (221^(1/2)+5)/7}
x in { (221^(1/2)-5)/(-7), (221^(1/2)+5)/7 }
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