Advanced MathEasy–MediumPositive solution of a cubic minus a linear term
Advanced Math practice question
If x³ − x = 0 and x > 0, what is the value of x?
Answer: 1
x(x² − 1) = 0 gives x = 0, 1, or −1. The positive solution is 1.
Common wrong answers
- If you answered 0
- 0 is a solution but not positive.
- If you answered 3
- 3 gives 27 − 3 = 24.
- If you answered -1
- −1 is negative.
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