Fifth root of -243 is -3.
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3 3^5 = 243 (3 x 3) x (3 x 3) x 3 = 243 9 x 9 x 3 = 243 81 x 3 = 243
The square root of 243 is approximately 15.58845727.
81
The square root of the fifth root of x is the tenth root of x.
6.24025147