Advanced MathEasyEquation with two opposite solutions
Advanced Math practice question
Which of the following equations has both 3 and −3 as solutions?
- A. x² = 9Correct
- B. x = 9
- C. x² = −9
- D. 2x = 6
Answer: A. x² = 9
3² = 9 and (−3)² = 9.
Why the other answers are wrong
- B. x = 9
- x = 9 has the single solution 9.
- C. x² = −9
- No real number squares to −9.
- D. 2x = 6
- 2x = 6 has only x = 3.
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