Factorise x^4 + 64.

  1. (x^2 + 8)(x^2 - 8)
  2. (x^2 + 4x - 8)(x^2 - 4x - 8)
  3. (x^2 + 8)^2
  4. (x^2 + 4x + 8)(x^2 - 4x + 8)
Answer

D) (x^2 + 4x + 8)(x^2 - 4x + 8)

x^4 + 16x^2 + 64 - 16x^2 = (x^2 + 8)^2 - (4x)^2 = (x^2 + 4x + 8)(x^2 - 4x + 8). SLO M-09-A-18 · Understanding

Mathematics MCQ · More Factorization MCQs · Practise