16Hit1600
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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