a² - 9 = a² - 3² = (a - 3)(a + 3)
x⁴ - 1 = (x²)² - 1² = (x² - 1)(x² + 1)
p⁸ - 49 = (p⁴)² - 7² = (p⁴ - 7)(p⁴ + 7)
121 - (3n)² = 11² - (3n)² = (11 - 3n)(11 + 3n)
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Verified answer
a² - 9 = a² - 3² = (a - 3)(a + 3)
x⁴ - 1 = (x²)² - 1² = (x² - 1)(x² + 1)
p⁸ - 49 = (p⁴)² - 7² = (p⁴ - 7)(p⁴ + 7)
121 - (3n)² = 11² - (3n)² = (11 - 3n)(11 + 3n)