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Compute ∛x for any real number. Odd roots of negatives are real, so ∛(−27) = −3 works correctly here — something a plain square-root key cannot do.
Real cube root of any number — negatives included.
∛x = y where y³ = x
| Symbol | Meaning |
|---|---|
| x | Any real number |
∛27 = 3 because 3³ = 27, and ∛(−8) = −2 because (−2)³ = −8.
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Odd powers preserve sign: (−2)³ = −8, so −2 is a genuine real cube root. No real number squares to a negative.
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Content updated: September 2026