issb mathematics MCQ #5

If x² − 9 = 0, then x equals:

issb mathematics MCQ #5

  1. Question 1

    Q1. If x² − 9 = 0, then x equals:

    • A) 3 only
    • B) −3 only
    • C) 3 or −3
    • D) 9

    Answer: 3 or −3

    Explanation: x² = 9 → x = ±3. Both roots matter — ISSB often traps students who pick only the positive root.