9^2 = 3^x. Find the value of x.

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• A 4
• B 2
• C 1
• D 1/5

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Answer: A. 4

Write 9 as 3^2. Then 9^2 = (3^2)^2 = 3^(2 x 2) = 3^4, so x = 4. A quick check: 9^2 = 81 = 3 x 3 x 3 x 3.

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