a⁴ - 8a² - 4b² + 16 = (a⁴ - 8a² + 16) - 4b² = (a² - 4)² - (2b)² =
= (a² - 4 - 2b)(a² - 4 + 2b)
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a⁴ - 8a² - 4b² + 16 = (a⁴ - 8a² + 16) - 4b² = (a² - 4)² - (2b)² =
= (a² - 4 - 2b)(a² - 4 + 2b)