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D( a )
3*a-1 = 0
3*a-1 = 0
3*a-1 = 0
3*a-1 = 0 // + 1
3*a = 1 // : 3
a = 1/3
a in (-oo:1/3) U (1/3:+oo)
(18*a^2-(6*a)+16)/(3*a-1) = 0
(18*a^2-6*a+16)/(3*a-1) = 0
18*a^2-6*a+16 = 0
2*(9*a^2-3*a+8) = 0
9*a^2-3*a+8 = 0
DELTA = (-3)^2-(4*8*9)
DELTA = -279
DELTA < 0
2 = 0
2/(3*a-1) = 0
a belongs to the empty set
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