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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(2/2)*x+3/x+1+5 = 4/x-2 // - 4/x-2
(2/2)*x+3/x-(4/x)+1+2+5 = 0
(2/2)*x+3/x-4*x^-1+1+2+5 = 0
1*x^1-1*x^-1+8*x^0 = 0
(1*x^2+8*x^1-1*x^0)/(x^1) = 0 // * x^2
x^1*(1*x^2+8*x^1-1*x^0) = 0
x^1
x^2+8*x-1 = 0
x^2+8*x-1 = 0
DELTA = 8^2-(-1*1*4)
DELTA = 68
DELTA > 0
x = (68^(1/2)-8)/(1*2) or x = (-68^(1/2)-8)/(1*2)
x = (2*17^(1/2)-8)/2 or x = (-2*17^(1/2)-8)/2
x in { (-2*17^(1/2)-8)/2, (2*17^(1/2)-8)/2}
x in { (-2*17^(1/2)-8)/2, (2*17^(1/2)-8)/2 }
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