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Sticky Note
The factors of a² - 9 are _____?
  1. (a + 3) (a - 3)
  2. (a + 9) (a - 9)
  3. (a - 3) (a - 3)
  4. None of these
Explanation

Using difference of squares:

a² - 9 = a² - 3² = (a+3)(a-3)


Last verified on 16-03-2026

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