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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(7/2)*x-(5/x) = 5 // - 5
(7/2)*x-(5/x)-5 = 0
(7/2)*x-5*x^-1-5 = 0
7/2*x^1-5*x^-1-5*x^0 = 0
(7/2*x^2-5*x^1-5*x^0)/(x^1) = 0 // * x^2
x^1*(7/2*x^2-5*x^1-5*x^0) = 0
x^1
(7/2)*x^2-5*x-5 = 0
(7/2)*x^2-5*x-5 = 0
DELTA = (-5)^2-(-5*4*(7/2))
DELTA = 95
DELTA > 0
x = (95^(1/2)+5)/(2*(7/2)) or x = (5-95^(1/2))/(2*(7/2))
x = (95^(1/2)+5)/7 or x = (5-95^(1/2))/7
x in { (5-95^(1/2))/7, (95^(1/2)+5)/7}
x in { (5-95^(1/2))/7, (95^(1/2)+5)/7 }
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