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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4*x-(3*7*x)-(4/x)+5/x-1 = 0
4*x-21*x-4*x^-1+5/x-1 = 0
1*x^-1-17*x^1-1*x^0 = 0
(1*x^0-17*x^2-1*x^1)/(x^1) = 0 // * x^2
x^1*(1*x^0-17*x^2-1*x^1) = 0
x^1
1-17*x^2-x = 0
1-17*x^2-x = 0
DELTA = (-1)^2-(-17*1*4)
DELTA = 69
DELTA > 0
x = (69^(1/2)+1)/(-17*2) or x = (1-69^(1/2))/(-17*2)
x = (69^(1/2)+1)/(-34) or x = (1-69^(1/2))/(-34)
x in { (69^(1/2)+1)/(-34), (1-69^(1/2))/(-34)}
x in { (69^(1/2)+1)/(-34), (1-69^(1/2))/(-34) }
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