Explanation:
If log_x 64 = 3, then 64 = x³
4³ = x³
Since the indices are equal,
x = 4
Hence, x log₂8 = log₂8^x
= log₂8⁴
= log₂(2³)₄
= log₂2¹²
= 1 log₂ = 1(1)
= 12