What is a Cube Root?
The cube root of a number x is the value y such that y³ = x. For example, the cube root of 27 is 3 because 3 × 3 × 3 = 27.
∛x = x^(1/3)
Common Cube Roots
| Number | Cube Root | Check |
|---|---|---|
| 1 | 1 | 1³ = 1 |
| 8 | 2 | 2³ = 8 |
| 27 | 3 | 3³ = 27 |
| 64 | 4 | 4³ = 64 |
| 125 | 5 | 5³ = 125 |
| 216 | 6 | 6³ = 216 |
| 1000 | 10 | 10³ = 1000 |
Negative Numbers
Unlike square roots, cube roots of negative numbers are real. For example, ∛(−8) = −2, because (−2)³ = −8.