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D( q )
q = 0
q = 0
q = 0
q in (-oo:0) U (0:+oo)
5/q = 25*q // - 25*q
5/q-(25*q) = 0
5/q-25*q = 0
5*q^-1-25*q^1 = 0
(5*q^0-25*q^2)/(q^1) = 0 // * q^2
q^1*(5*q^0-25*q^2) = 0
q^1
5-25*q^2 = 0
5-25*q^2 = 0
DELTA = 0^2-(-25*4*5)
DELTA = 500
DELTA > 0
q = (500^(1/2)+0)/(-25*2) or q = (0-500^(1/2))/(-25*2)
q = (-5^(1/2))/5 or q = (1*5^(1/2))/5
q in { (-5^(1/2))/5, (1*5^(1/2))/5}
q in { (-5^(1/2))/5, (1*5^(1/2))/5 }
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