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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/x = (7/2)*x-15 // - (7/2)*x-15
5/x-((7/2)*x)+15 = 0
(-7/2)*x+5/x+15 = 0
5*x^-1-7/2*x^1+15*x^0 = 0
(15*x^1-7/2*x^2+5*x^0)/(x^1) = 0 // * x^2
x^1*(15*x^1-7/2*x^2+5*x^0) = 0
x^1
(-7/2)*x^2+15*x+5 = 0
(-7/2)*x^2+15*x+5 = 0
DELTA = 15^2-(4*5*(-7/2))
DELTA = 295
DELTA > 0
x = (295^(1/2)-15)/(2*(-7/2)) or x = (-295^(1/2)-15)/(2*(-7/2))
x = (295^(1/2)-15)/(-7) or x = (295^(1/2)+15)/7
x in { (295^(1/2)-15)/(-7), (295^(1/2)+15)/7}
x in { (295^(1/2)-15)/(-7), (295^(1/2)+15)/7 }
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