If the real values of x which satisfy: are on the interval , find the value of
Obs: a<b<c<d
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lo g 3 ( x ) 2 − 2 4 + lo g x 9 1 > 1 ⇒ lo g 3 x − 1 2 − lo g 3 x 2 > 1
Now putting lo g 3 x = y we get y − 1 2 − y 2 − 1 > 0 ⇒ y ( y − 1 ) ( y − 2 ) ( y + 1 ) < 0 ⇒ y ∈ ( − 1 , 0 ) ∪ ( 1 , 2 ) ⇒ x ∈ ( 3 1 , 1 ) ∪ ( 3 , 9 ) Answer is 1 + 1 + 3 + 9 = 1 4