Ok, I got this expression:

$\displaystyle (\frac{1}{\sqrt2} + 3)^n$

Then I have:

$\displaystyle T_4 = 3\times\sqrt2\times T_3$

Find n.

I got absolutely no idea what $\displaystyle T_3$ and $\displaystyle T_4$ are, so I have no clue how to solve this.