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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
16 = 3*x-(2/x)-5 // - 3*x-(2/x)-5
2/x-(3*x)+5+16 = 0
2/x-3*x+5+16 = 0
2*x^-1-3*x^1+21*x^0 = 0
(21*x^1-3*x^2+2*x^0)/(x^1) = 0 // * x^2
x^1*(21*x^1-3*x^2+2*x^0) = 0
x^1
21*x-3*x^2+2 = 0
21*x-3*x^2+2 = 0
DELTA = 21^2-(-3*2*4)
DELTA = 465
DELTA > 0
x = (465^(1/2)-21)/(-3*2) or x = (-465^(1/2)-21)/(-3*2)
x = (465^(1/2)-21)/(-6) or x = (465^(1/2)+21)/6
x in { (465^(1/2)-21)/(-6), (465^(1/2)+21)/6}
x in { (465^(1/2)-21)/(-6), (465^(1/2)+21)/6 }
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