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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
y = x-(3/x)-4 // - x-(3/x)-4
3/x-x+y+4 = 0
3*x^-1-1*x^1+4*x^0 = 0
(4*x^1-1*x^2+3*x^0)/(x^1) = 0 // * x^2
x^1*(4*x^1-1*x^2+3*x^0) = 0
x^1
4*x-x^2+3 = 0
4*x-x^2+3 = 0
DELTA = 4^2-(-1*3*4)
DELTA = 28
DELTA > 0
x = (28^(1/2)-4)/(-1*2) or x = (-28^(1/2)-4)/(-1*2)
x = (2*7^(1/2)-4)/(-2) or x = (-2*7^(1/2)-4)/(-2)
x in { (2*7^(1/2)-4)/(-2), (-2*7^(1/2)-4)/(-2)}
x in { (2*7^(1/2)-4)/(-2), (-2*7^(1/2)-4)/(-2) }
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