$\"\"$

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The values are $\"\"$ .

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The 3rd 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 each side by 4)

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$\"\"$ (Cancel common terms)

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

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

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$\"\"$ (Divide: $\"\"$ ) $\"\"$

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The value of $\"\"$ .