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D( q )
q = 0
q = 0
q = 0
q in (-oo:0) U (0:+oo)
10*q = 5*q+200/q // - 5*q+200/q
10*q-(5*q)-(200/q) = 0
10*q-5*q-200*q^-1 = 0
5*q^1-200*q^-1 = 0
(5*q^2-200*q^0)/(q^1) = 0 // * q^2
q^1*(5*q^2-200*q^0) = 0
q^1
5*q^2-200 = 0
5*q^2-200 = 0
DELTA = 0^2-(-200*4*5)
DELTA = 4000
DELTA > 0
q = (4000^(1/2)+0)/(2*5) or q = (0-4000^(1/2))/(2*5)
q = 2*10^(1/2) or q = -2*10^(1/2)
q in { -2*10^(1/2), 2*10^(1/2)}
q in { -2*10^(1/2), 2*10^(1/2) }
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