# Algebra!!!!!!!!!!

• Sep 30th 2008, 05:02 AM
Withz
Algebra!!!!!!!!!!
Hey! I'm back again! It seems so simple! (Worried)

How can I do this:::

http://img516.imageshack.us/img516/8240/mathxf1.png
http://img516.imageshack.us/img516/m...png/1/w451.png

See you!!!
• Sep 30th 2008, 05:57 AM
Chop Suey
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:

$2^{2x} + 2(2^{0}) + 2^{-2x} = 9$
• Sep 30th 2008, 11:05 AM
Withz
thanx
Yeah! That's it!

Thank you so much!!! (Clapping) It Helps me a lot!!!