$\"\"$

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The 2nd term and 5th term of the geometric sequence is $\"\"$ .

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(Apply nth term of a geometric sequence formula: $\"\"$ )

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$\"\"$ (Substitute 2 for n)

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$\"\"$ (Substitute 3 for $\"\"$ )

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$\"\"$ --------------------> (1) $\"\"$

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$\"\"$ (Substitute 5 for n)

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$\"\"$ (Substitute $\"\"$ )

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$\"\"$ --------------------> (2)

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$\"\"$ (Dividing the equations (2) by (1))

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$\"\"$

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$\"\"$ (Cancel common terms)

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$\"\"$ $\"\"$

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$\"\"$ (Take each side by cube root)

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$\"\"$ (Simplify)

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$\"\"$ (Substitute the value $\"\"$ in equation)

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$\"\"$ (Simplify) $\"\"$

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The 1st term of the geometric sequence is $\"\"$ .