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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
11/x+2/5+4 = (7/2)*x // - (7/2)*x
11/x-((7/2)*x)+2/5+4 = 0
(-7/2)*x+11/x+2/5+4 = 0
11*x^-1-7/2*x^1+22/5*x^0 = 0
(22/5*x^1-7/2*x^2+11*x^0)/(x^1) = 0 // * x^2
x^1*(22/5*x^1-7/2*x^2+11*x^0) = 0
x^1
(-7/2)*x^2+(22/5)*x+11 = 0
(-7/2)*x^2+(22/5)*x+11 = 0
DELTA = (22/5)^2-(4*11*(-7/2))
DELTA = 4334/25
DELTA > 0
x = ((4334/25)^(1/2)-(22/5))/(2*(-7/2)) or x = (-(22/5)-(4334/25)^(1/2))/(2*(-7/2))
x = ((4334/25)^(1/2)-22/5)/(-7) or x = ((4334/25)^(1/2)+22/5)/7
x in { ((4334/25)^(1/2)-22/5)/(-7), ((4334/25)^(1/2)+22/5)/7}
x in { ((4334/25)^(1/2)-22/5)/(-7), ((4334/25)^(1/2)+22/5)/7 }
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