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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4*x-(11/x)-1 = 0
4*x-11*x^-1-1 = 0
4*x^1-11*x^-1-1*x^0 = 0
(4*x^2-1*x^1-11*x^0)/(x^1) = 0 // * x^2
x^1*(4*x^2-1*x^1-11*x^0) = 0
x^1
4*x^2-x-11 = 0
4*x^2-x-11 = 0
DELTA = (-1)^2-(-11*4*4)
DELTA = 177
DELTA > 0
x = (177^(1/2)+1)/(2*4) or x = (1-177^(1/2))/(2*4)
x = (177^(1/2)+1)/8 or x = (1-177^(1/2))/8
x in { (1-177^(1/2))/8, (177^(1/2)+1)/8}
x in { (1-177^(1/2))/8, (177^(1/2)+1)/8 }
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