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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6/x = x/150 // - x/150
6/x-(x/150) = 0
6*x^-1-1/150*x^1 = 0
(6*x^0-1/150*x^2)/(x^1) = 0 // * x^2
x^1*(6*x^0-1/150*x^2) = 0
x^1
(-1/150)*x^2+6 = 0
(-1/150)*x^2+6 = 0
DELTA = 0^2-(4*6*(-1/150))
DELTA = 4/25
DELTA > 0
x = ((4/25)^(1/2)+0)/(2*(-1/150)) or x = (0-(4/25)^(1/2))/(2*(-1/150))
x = -30 or x = 30
x in { -30, 30}
x in { -30, 30 }
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