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JAMB Mathematics 1982 Question 13

Question 13

Inequalities

What is the least possible value of 9/(1 + 2x2) if 0 ≤ x ≤ 2?

  1. A.9
  2. B.0
  3. C.1
  4. D.2
  5. E.1/2.
Show the answer and explanation

Answer: C (1)

Explanation

The fraction is smallest when the denominator is largest, at x = 2: 9/(1 + 8) = 1.