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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4/x+1 = (11/12)*x // - (11/12)*x
4/x-((11/12)*x)+1 = 0
(-11/12)*x+4/x+1 = 0
4*x^-1-11/12*x^1+1*x^0 = 0
(1*x^1-11/12*x^2+4*x^0)/(x^1) = 0 // * x^2
x^1*(1*x^1-11/12*x^2+4*x^0) = 0
x^1
(-11/12)*x^2+x+4 = 0
(-11/12)*x^2+x+4 = 0
DELTA = 1^2-(4*4*(-11/12))
DELTA = 47/3
DELTA > 0
x = ((47/3)^(1/2)-1)/(2*(-11/12)) or x = (-(47/3)^(1/2)-1)/(2*(-11/12))
x = -6/11*((47/3)^(1/2)-1) or x = 6/11*((47/3)^(1/2)+1)
x in { -6/11*((47/3)^(1/2)-1), 6/11*((47/3)^(1/2)+1)}
x in { -6/11*((47/3)^(1/2)-1), 6/11*((47/3)^(1/2)+1) }
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