Advanced MathEasy–MediumBoth solutions of a square-root form
Advanced Math practice question
Which of the following lists all real solutions of x² − 25 = 0?
- A. x = 5 and x = −5Correct
- B. x = 5 only
- C. x = 25 and x = −25
- D. x = 12.5 only
Answer: A. x = 5 and x = −5
x² = 25 has both square roots as solutions.
Why the other answers are wrong
- B. x = 5 only
- −5 also squares to 25.
- C. x = 25 and x = −25
- 25² = 625, not 25.
- D. x = 12.5 only
- 12.5 is 25 ÷ 2, not a square root.
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