Advanced MathEasyAll solutions of a simple quadratic
Advanced Math practice question
Which of the following lists all the real solutions of x² = 49?
- A. 7 and −7Correct
- B. 7 only
- C. 24.5 only
- D. 49 and −49
Answer: A. 7 and −7
Both 7 and −7 square to 49.
Why the other answers are wrong
- B. 7 only
- −7 also works.
- C. 24.5 only
- 24.5 halves 49; the equation asks for a square root.
- D. 49 and −49
- 49² is 2,401, not 49.
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