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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3/x = x/300 // - x/300
3/x-(x/300) = 0
3*x^-1-1/300*x^1 = 0
(3*x^0-1/300*x^2)/(x^1) = 0 // * x^2
x^1*(3*x^0-1/300*x^2) = 0
x^1
(-1/300)*x^2+3 = 0
(-1/300)*x^2+3 = 0
DELTA = 0^2-(3*4*(-1/300))
DELTA = 1/25
DELTA > 0
x = ((1/25)^(1/2)+0)/(2*(-1/300)) or x = (0-(1/25)^(1/2))/(2*(-1/300))
x = -30 or x = 30
x in { -30, 30}
x in { -30, 30 }
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