Factorise 27a^3 - 125.

  1. (3a - 5)(9a^2 + 15a + 25)
  2. (3a - 5)(9a^2 - 15a + 25)
  3. (3a + 5)(9a^2 - 15a + 25)
  4. (3a - 5)(9a^2 + 25)
Answer

A) (3a - 5)(9a^2 + 15a + 25)

a^3 - b^3 form with 3a and 5: (3a - 5) ((3a)^2 + 3a 5 + 5^2 ). SLO M-09-A-18 · Understanding

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