1. ## Algebra!!!!!!!!!!

Hey! I'm back again! It seems so simple!

How can I do this:::

See you!!!

2. Note that $4^{x} + 4^{-x} = 2^{2x} + 2^{-2x}$

And we know that $2^{x} + 2^{-x} = 3$. By squaring both sides we get:

$2^{2x} + 2(2^{0}) + 2^{-2x} = 9$

3. ## thanx

Yeah! That's it!

Thank you so much!!! It Helps me a lot!!!