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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4/3 = x-(3/x) // - x-(3/x)
3/x-x+4/3 = 0
3*x^-1-1*x^1+4/3*x^0 = 0
(4/3*x^1-1*x^2+3*x^0)/(x^1) = 0 // * x^2
x^1*(4/3*x^1-1*x^2+3*x^0) = 0
x^1
(4/3)*x-x^2+3 = 0
(4/3)*x-x^2+3 = 0
DELTA = (4/3)^2-(-1*3*4)
DELTA = 124/9
DELTA > 0
x = ((124/9)^(1/2)-(4/3))/(-1*2) or x = (-(4/3)-(124/9)^(1/2))/(-1*2)
x = ((124/9)^(1/2)-4/3)/(-2) or x = ((124/9)^(1/2)+4/3)/2
x in { ((124/9)^(1/2)-4/3)/(-2), ((124/9)^(1/2)+4/3)/2}
x in { ((124/9)^(1/2)-4/3)/(-2), ((124/9)^(1/2)+4/3)/2 }
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