Answer:
(9a¹⁸ + 8b⁸)(9a¹⁸ - 8b⁸)
Explanation:
The expression 81a³⁶ - 64b¹⁶ can be factored as (9a¹⁸)² - (8b⁸)².
This is a difference between the squares factorization (a²-b²), which can be expressed as (a + b)(a - b).
In this case, a = 9a¹⁸ and b = 8b⁸.
Substituting these values into the factorization, we get:
(9a¹⁸ + 8b⁸)(9a¹⁸ - 8b⁸)