SOLUTION: log2 log2 logx 81=1

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Question 1028381: log2 log2 logx 81=1
Answer by robertb(5830) About Me  (Show Source):
You can put this solution on YOUR website!
log%282%2C+log%282%2C+log%28x%2C81%29%29%29+=+1 ==> log%282%2C+log%28x%2C81%29%29+=+2 ==> log%28x%2C81%29+=+4 ==> x%5E4+=+81 ==> x = 3. (x = -3 is unacceptable because that base of the logarithm must not be positive and not equal to 1.)