SOLUTION: Solve, 81^(x) = 9^(x+4).

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Question 550554: Solve, 81^(x) = 9^(x+4).
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
81^(x) = 9^(x+4)


(9^2)^(x) = 9^(x+4)


9^(2x) = 9^(x+4)

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Since the bases are equal, the exponents are equal.

2x = x+4

2x - x = 4

x = 4