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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3/x-x-1+2 = 8 // - 8
3/x-x-8-1+2 = 0
3*x^-1-1*x^1-7*x^0 = 0
(3*x^0-1*x^2-7*x^1)/(x^1) = 0 // * x^2
x^1*(3*x^0-1*x^2-7*x^1) = 0
x^1
3-x^2-7*x = 0
3-x^2-7*x = 0
DELTA = (-7)^2-(-1*3*4)
DELTA = 61
DELTA > 0
x = (61^(1/2)+7)/(-1*2) or x = (7-61^(1/2))/(-1*2)
x = (61^(1/2)+7)/(-2) or x = (7-61^(1/2))/(-2)
x in { (61^(1/2)+7)/(-2), (7-61^(1/2))/(-2)}
x in { (61^(1/2)+7)/(-2), (7-61^(1/2))/(-2) }
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