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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/x-(5/x)-7-4 = 3*x+11/x-28 // - 3*x+11/x-28
1/x-(3*x)-(5/x)-(11/x)-7-4+28 = 0
1/x-3*x-5*x^-1-11*x^-1-7-4+28 = 0
17*x^0-3*x^1-15*x^-1 = 0
(17*x^1-3*x^2-15*x^0)/(x^1) = 0 // * x^2
x^1*(17*x^1-3*x^2-15*x^0) = 0
x^1
17*x-3*x^2-15 = 0
17*x-3*x^2-15 = 0
DELTA = 17^2-(-15*(-3)*4)
DELTA = 109
DELTA > 0
x = (109^(1/2)-17)/(-3*2) or x = (-109^(1/2)-17)/(-3*2)
x = (109^(1/2)-17)/(-6) or x = (109^(1/2)+17)/6
x in { (109^(1/2)-17)/(-6), (109^(1/2)+17)/6}
x in { (109^(1/2)-17)/(-6), (109^(1/2)+17)/6 }
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