Factorise 16x^4 + 4x^2 + 1.

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

B) (4x^2 + 2x + 1)(4x^2 - 2x + 1)

16x^4 + 8x^2 + 1 - 4x^2 = (4x^2 + 1)^2 - (2x)^2 = (4x^2 + 2x + 1)(4x^2 - 2x + 1). SLO M-09-A-18 · Understanding

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