Putting both equations into Y= and studying the table can help us solve this one!!
Now we must read carefully!  What is the largest integer for which f(x)>g(x)?
For x = 7, f(x) = 13484 and is greater than g(x) = 2187

For x = 8, f(x) = 22409 and is still greater than g(x) = 6561

For x = 9, f(x) = 35244 and is still greater than g(x) = 19683

For x = 10, f(x) = 53009 and is NO LONGER greater than g(x) = 59049