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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
30/x-((30/2)*x) = 3 // - 3
30/x-((30/2)*x)-3 = 0
30/x-15*x-3 = 0
30*x^-1-15*x^1-3*x^0 = 0
(30*x^0-15*x^2-3*x^1)/(x^1) = 0 // * x^2
x^1*(30*x^0-15*x^2-3*x^1) = 0
x^1
30-15*x^2-3*x = 0
30-15*x^2-3*x = 0
DELTA = (-3)^2-(-15*4*30)
DELTA = 1809
DELTA > 0
x = (1809^(1/2)+3)/(-15*2) or x = (3-1809^(1/2))/(-15*2)
x = (3*201^(1/2)+3)/(-30) or x = (3-3*201^(1/2))/(-30)
x in { (3*201^(1/2)+3)/(-30), (3-3*201^(1/2))/(-30)}
x in { (3*201^(1/2)+3)/(-30), (3-3*201^(1/2))/(-30) }
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