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WAEC Mathematics 2010 Question 30

Question 30

Progressions

The nth term of the sequence: −2, 4, −8, 16, … is given by

  1. A.Tn = 2n
  2. B.Tn = (−2)n
  3. C.Tn = (−2n)
  4. D.Tn = n2
Show the answer and explanation

Answer: B (Tn = (−2)n)

Explanation

Each term is the previous one times −2, starting with −2: Tn = (−2)n.