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