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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2 = x+7/x-11 // - x+7/x-11
2-x-(7/x)+11 = 0
2-x-7*x^-1+11 = 0
13*x^0-1*x^1-7*x^-1 = 0
(13*x^1-1*x^2-7*x^0)/(x^1) = 0 // * x^2
x^1*(13*x^1-1*x^2-7*x^0) = 0
x^1
13*x-x^2-7 = 0
13*x-x^2-7 = 0
DELTA = 13^2-(-7*(-1)*4)
DELTA = 141
DELTA > 0
x = (141^(1/2)-13)/(-1*2) or x = (-141^(1/2)-13)/(-1*2)
x = (141^(1/2)-13)/(-2) or x = (141^(1/2)+13)/2
x in { (141^(1/2)-13)/(-2), (141^(1/2)+13)/2}
x in { (141^(1/2)-13)/(-2), (141^(1/2)+13)/2 }
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