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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4*x-(3/x)-1 = 0
4*x-3*x^-1-1 = 0
4*x^1-3*x^-1-1*x^0 = 0
(4*x^2-1*x^1-3*x^0)/(x^1) = 0 // * x^2
x^1*(4*x^2-1*x^1-3*x^0) = 0
x^1
4*x^2-x-3 = 0
4*x^2-x-3 = 0
DELTA = (-1)^2-(-3*4*4)
DELTA = 49
DELTA > 0
x = (49^(1/2)+1)/(2*4) or x = (1-49^(1/2))/(2*4)
x = 1 or x = -3/4
x in { -3/4, 1}
x in { -3/4, 1 }
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