-54 is not a perfect cube; thus, the answer contains cube roots.
Because this site doesn't allow us to insert images in answers, we'll let C(x) represent "the cube root of X" such that C(8) = 2, etc. The answer, then, is 3 * C(-2).
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Negative 2 (times) cube root of 54 = -7.55953 Negative 2 (plus) cube root of 54 = 1.77976
54 = 2 x 27 = 2 x 33
2 cube root 24 plus 3 cube root 81 is 18.7492444
the index of a cube root is 3.
the cube root of 64 =4