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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
200/x = 50*x // - 50*x
200/x-(50*x) = 0
200/x-50*x = 0
200*x^-1-50*x^1 = 0
(200*x^0-50*x^2)/(x^1) = 0 // * x^2
x^1*(200*x^0-50*x^2) = 0
x^1
200-50*x^2 = 0
200-50*x^2 = 0
DELTA = 0^2-(-50*4*200)
DELTA = 40000
DELTA > 0
x = (40000^(1/2)+0)/(-50*2) or x = (0-40000^(1/2))/(-50*2)
x = -2 or x = 2
x in { -2, 2}
x in { -2, 2 }
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