Solution: Solve 3x = x9
Given:
3x = x9
Taking logarithm on both sides:
log(3x) = log(x9)
Using log properties:
x log 3 = 9 log x
Dividing by x:
log 3 = 9 log(x1/x)
log(x1/x) =1/9(log3)
log(x1/x) =(log3^1/9)
Hence,
x1/x = 31/9
Checking x = 27:
327 = (33)9 = 279
Therefore,
x = 27


