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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
X-x-(2/x)-(6/6)-6 = 0
X-x-2*x^-1-6-1 = 0
-1*x^1-2*x^-1-7*x^0 = 0
(-1*x^2-7*x^1-2*x^0)/(x^1) = 0 // * x^2
x^1*(-1*x^2-7*x^1-2*x^0) = 0
x^1
-x^2-7*x-2 = 0
-x^2-7*x-2 = 0
DELTA = (-7)^2-(-2*(-1)*4)
DELTA = 41
DELTA > 0
x = (41^(1/2)+7)/(-1*2) or x = (7-41^(1/2))/(-1*2)
x = (41^(1/2)+7)/(-2) or x = (7-41^(1/2))/(-2)
x in { (41^(1/2)+7)/(-2), (7-41^(1/2))/(-2)}
x in { (41^(1/2)+7)/(-2), (7-41^(1/2))/(-2) }
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