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D( q )
q = 0
q = 0
q = 0
q in (-oo:0) U (0:+oo)
3*q-8 = 6/q // - 6/q
3*q-(6/q)-8 = 0
3*q-6*q^-1-8 = 0
3*q^1-6*q^-1-8*q^0 = 0
(3*q^2-8*q^1-6*q^0)/(q^1) = 0 // * q^2
q^1*(3*q^2-8*q^1-6*q^0) = 0
q^1
3*q^2-8*q-6 = 0
3*q^2-8*q-6 = 0
DELTA = (-8)^2-(-6*3*4)
DELTA = 136
DELTA > 0
q = (136^(1/2)+8)/(2*3) or q = (8-136^(1/2))/(2*3)
q = (2*34^(1/2)+8)/6 or q = (8-2*34^(1/2))/6
q in { (8-2*34^(1/2))/6, (2*34^(1/2)+8)/6}
q in { (8-2*34^(1/2))/6, (2*34^(1/2)+8)/6 }
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