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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4*x-23 = 6/x // - 6/x
4*x-(6/x)-23 = 0
4*x-6*x^-1-23 = 0
4*x^1-6*x^-1-23*x^0 = 0
(4*x^2-23*x^1-6*x^0)/(x^1) = 0 // * x^2
x^1*(4*x^2-23*x^1-6*x^0) = 0
x^1
4*x^2-23*x-6 = 0
4*x^2-23*x-6 = 0
DELTA = (-23)^2-(-6*4*4)
DELTA = 625
DELTA > 0
x = (625^(1/2)+23)/(2*4) or x = (23-625^(1/2))/(2*4)
x = 6 or x = -1/4
x in { -1/4, 6}
x in { -1/4, 6 }
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