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D( q )
q = 0
q = 0
q = 0
q in (-oo:0) U (0:+oo)
(1/5)*q = 9-(2/q) // - 9-(2/q)
(1/5)*q+2/q-9 = 0
1/5*q^1+2*q^-1-9*q^0 = 0
(1/5*q^2-9*q^1+2*q^0)/(q^1) = 0 // * q^2
q^1*(1/5*q^2-9*q^1+2*q^0) = 0
q^1
(1/5)*q^2-9*q+2 = 0
(1/5)*q^2-9*q+2 = 0
DELTA = (-9)^2-(2*4*(1/5))
DELTA = 397/5
DELTA > 0
q = ((397/5)^(1/2)+9)/(2*(1/5)) or q = (9-(397/5)^(1/2))/(2*(1/5))
q = 5/2*((397/5)^(1/2)+9) or q = 5/2*(9-(397/5)^(1/2))
q in { 5/2*(9-(397/5)^(1/2)), 5/2*((397/5)^(1/2)+9)}
q in { 5/2*(9-(397/5)^(1/2)), 5/2*((397/5)^(1/2)+9) }
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