Use the formula a2 – b2 = (a + b)(a – b) to factor completely.What are the factors of 36x8 – 49?

Write 36x⁸ as (6x⁴)² and 49 as 7². Using a² − b² = (a + b)(a − b), the expression factors as (6x⁴ − 7)(6x⁴ + 7), which is choice C.

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