JAMB Mathematics 1983 Question 42

Question 42

Indices

Simplify ∛(27a−9/8)

  1. A.9a−2/2
  2. B.9a−3/2
  3. C.3/(2a3)
  4. D.2/(3a2)
  5. E.3a2/2
Show the answer and explanation

Answer: C (3/(2a3))

Explanation

∛27 = 3, ∛8 = 2 and ∛a⁻⁹ = a⁻³, so the result is 3/(2a³).