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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2*x = 300/x // - 300/x
2*x-(300/x) = 0
2*x-300*x^-1 = 0
2*x^1-300*x^-1 = 0
(2*x^2-300*x^0)/(x^1) = 0 // * x^2
x^1*(2*x^2-300*x^0) = 0
x^1
2*x^2-300 = 0
2*x^2-300 = 0
DELTA = 0^2-(-300*2*4)
DELTA = 2400
DELTA > 0
x = (2400^(1/2)+0)/(2*2) or x = (0-2400^(1/2))/(2*2)
x = 5*6^(1/2) or x = -5*6^(1/2)
x in { -5*6^(1/2), 5*6^(1/2)}
x in { -5*6^(1/2), 5*6^(1/2) }
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