BREAKING: Target Test Prep releases Brand New 2026 On Demand GMAT prep course

Redeem

Exponents with like bases

This topic has expert replies
Post new topic Post Reply
Previous Topic Next Topic
Newbie | Next Rank: 10 Posts
Posts: 1
Joined: Sat Feb 21, 2009 9:33 pm

Exponents with like bases

by MizzouTiger » Sat Feb 21, 2009 9:37 pm
Question:2 + 2 + 2^2 + 2^3 + 2^4 + 2^5 + 2^6 + 2^7 +2^8 =

The answer is 2^9, but why? I can't seem to find the exponent rule that applies to this problem.
GMAC GMATprep 1 - 680
GMAC GMATprep 2 - 730
Kaplan Practice Test - 560 (another victim of Kaplan's artificially low scores)
Top
Source: — Problem Solving |
Master | Next Rank: 500 Posts
Posts: 258
Joined: Thu Aug 07, 2008 5:32 am
Thanked: 16 times

Re: Exponents with like bases

by x2suresh » Sat Feb 21, 2009 10:23 pm
MizzouTiger wrote:Question:2 + 2 + 2^2 + 2^3 + 2^4 + 2^5 + 2^6 + 2^7 +2^8 =

The answer is 2^9, but why? I can't seem to find the exponent rule that applies to this problem.
clearly 2+2 = 2^2
2^2+ 2^2 = 2^3 .. and so on.

2 + 2 + 2^2 + 2^3 + 2^4 + 2^5 + 2^6 + 2^7 +2^8
= 2^2+ 2^2 + 2^3 + 2^4 + 2^5 + 2^6 + 2^7 +2^8
= 2^8+2^8 = 2^9
Top
Post new topic Post Reply
• Page 1 of 1