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

1. ±6

2. 6

3. -6

4. ±12

Express each of the following in exponential form :

(i) log₈ 0.125 = -1

(ii) log₁₀ 0.01 = -2

(iii) log_a A = x

(iv) log₁₀ 1 = 0

Solve for x : log₁₀ x = -2.