If log₄ x = 2.5, the value of x is :

1. 12.5

2. 32

3. 10

4. 20

If log_x 64 = 1.5, the value of x is :

1. 48

2. 32

3. 64

4. 16

If log₂ (x² - 4) = 5, the value of x is :

1. ±6

2. 6

3. -6

4. ±12