Factorise x^4 + 4.

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

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

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

Mathematics MCQ · More Factorization MCQs · Practise