Is there a faster way to solve this?

[Lookingfor700GMAT]

2+2+2^2+2^3+2^4+2^5+2^6+2^7+2^8 = 2^9

I spent too long (in my view) manually adding up the numbers. Is there a faster way?

[papgust]

Check this

https://www.beatthegmat.com/gprep-2-2-2- ... 36087.html

[Lookingfor700GMAT]

Thanks Papgust. I posted a bunch of questions without searching. I'll be more careful in future.