Soru 1
Solve the inequality: $\log_{1/3} (x^2 - 4) > \log_{1/3} (5)$
- A
$-3 < x < 3$
- B
$x < -2$ or $x > 2$
- Doğru cevap
$-3 < x < -2$ or $2 < x < 3$
- D
$x > 2$
- E
$x < -3$ or $x > 3$
Çözüm
Base $\frac{1}{3}$ is between 0 and 1, so the logarithmic function is decreasing, and the inequality direction changes: from $\log_{1/3} (x^2 - 4) > \log_{1/3} (5)$, we get $x^2 - 4 < 5$. Solving: $x^2 < 9$, so $-3 < x < 3$. Domain requires $x^2 - 4 > 0$, i.e., $x^2 > 4$, so $x < -2$ or $x > 2$. Combining these intervals, the solution is $(-3 < x < -2) \cup (2 < x < 3)$.