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D( q )
q = 0
q = 0
q = 0
q in (-oo:0) U (0:+oo)
54/q = 15-q // - 15-q
q+54/q-15 = 0
1*q^1+54*q^-1-15*q^0 = 0
(1*q^2-15*q^1+54*q^0)/(q^1) = 0 // * q^2
q^1*(1*q^2-15*q^1+54*q^0) = 0
q^1
q^2-15*q+54 = 0
q^2-15*q+54 = 0
DELTA = (-15)^2-(1*4*54)
DELTA = 9
DELTA > 0
q = (9^(1/2)+15)/(1*2) or q = (15-9^(1/2))/(1*2)
q = 9 or q = 6
q in { 6, 9}
q in { 6, 9 }
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