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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
14/x = x-5 // - x-5
14/x-x+5 = 0
14*x^-1-1*x^1+5*x^0 = 0
(5*x^1-1*x^2+14*x^0)/(x^1) = 0 // * x^2
x^1*(5*x^1-1*x^2+14*x^0) = 0
x^1
5*x-x^2+14 = 0
5*x-x^2+14 = 0
DELTA = 5^2-(-1*4*14)
DELTA = 81
DELTA > 0
x = (81^(1/2)-5)/(-1*2) or x = (-81^(1/2)-5)/(-1*2)
x = -2 or x = 7
x in { -2, 7}
x in { -2, 7 }
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