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JAMB Mathematics 1988 Question 20

Question 20

Inequalities

List the integral values of x which satisfy the inequality −1 < 5 − 2x ≤ 7

  1. A.−1, 0, 1, 2
  2. B.0, 1, 2, 3.
  3. C.−1, 0, 1, 2, 3.
  4. D.−1, 0, 2, 3.
Show the answer and explanation

Answer: A (−1, 0, 1, 2)

Explanation

Subtract 5: −6 < −2x ≤ 2. Divide by −2 and reverse the signs: 3 > x ≥ −1. The integers are −1, 0, 1, 2.