Windows calculator states it as... 2.9240177382128660655067873601379
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-8x3 = -24 which has no square root in Real numbers. The square root of -24 is ±4.898979*i where i is the imaginary square root of -1.
-1X-1X-1=-1 therefore cube root of -1 = -1
The real cube root of 1 is 1, since 13 = 1. There also a pair of complex cube roots.
The cube root of 1 will also be 1. You can check with the complementary operation: 1*1*1=1 (true).
The cube root of -1 ("minus 1" or "negative 1") is -1. In fact all odd-numbered roots (i.e., the fifth root, the seventh root, the ninth root, etc.) of -1 are -1.