Advanced MathEasySum of both square roots
Advanced Math practice question
If x² = 36, what is the sum of all possible values of x?
- A. 0Correct
- B. 6
- C. 12
- D. −6
Answer: A. 0
The solutions are 6 and −6, whose sum is 0.
Why the other answers are wrong
- B. 6
- 6 is only the positive solution.
- C. 12
- 12 forgets that one solution is negative.
- D. −6
- −6 is only the negative solution.
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