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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/x-6 = 7*x // - 7*x
2/x-(7*x)-6 = 0
2/x-7*x-6 = 0
2*x^-1-7*x^1-6*x^0 = 0
(2*x^0-7*x^2-6*x^1)/(x^1) = 0 // * x^2
x^1*(2*x^0-7*x^2-6*x^1) = 0
x^1
2-7*x^2-6*x = 0
2-7*x^2-6*x = 0
DELTA = (-6)^2-(-7*2*4)
DELTA = 92
DELTA > 0
x = (92^(1/2)+6)/(-7*2) or x = (6-92^(1/2))/(-7*2)
x = (2*23^(1/2)+6)/(-14) or x = (6-2*23^(1/2))/(-14)
x in { (2*23^(1/2)+6)/(-14), (6-2*23^(1/2))/(-14)}
x in { (2*23^(1/2)+6)/(-14), (6-2*23^(1/2))/(-14) }
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