\"\"

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The given sequence \"\".

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\"\"

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Apply nth term of a geometric sequence formula \"\".

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\"\"                      (Substitute \"\")

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\"\"                          (Subtract power: \"\")

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\"\"                                  (Multiply: \"\")

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\"\"                                   (Rewrite \"\")

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\"\"                                      (Apply equal powers formula: \"\")\"\"

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Apply 2nd term of a geometric sequence formula \"\".

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\"\"                  (Substitute \"\")

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\"\"                      (Subtract power: \"\")

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\"\"                                   (Multiply: \"\")\"\"

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Apply 3nd term of a geometric sequence formula \"\".

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\"\"                  (Substitute \"\")

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\"\"                      (Subtract power: \"\")

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\"\"                               (Evaluate power: \"\")

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\"\"                                   (Multiply: \"\")\"\"

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The geometric means are 3, 9.