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write in set builder notation 1 3 9 27 81 243

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write in set builder notation { 1,3,9,27,81,243,...}

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Answer to a math question write in set builder notation { 1,3,9,27,81,243,...}

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{x|x = 3^n , 0<=n}

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solve R the following equation 4 x squared - 35 - 9 over x squared is equal to 0