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

Redeem
TTP OnDemand GMAT Video Course
Featured Course

Target Test Prep GMAT OnDemand

Scott Woodbury-Stewart’s private virtual classroom — 400 hours of master-class video lessons for the GMAT Focus Edition.

  • 715+ score guarantee — highest in the industry (99th percentile)
  • 52 chapters · 1,500+ lessons · 4,000+ practice questions
  • 400 hours of video · 1,500+ instructor-led HD smartboard lessons
  • 300,000+ students accepted to Harvard, Stanford, Wharton, Booth & Sloan & more
  • 24/7 live support + weekly Zoom office hours with GMAT instructors
  • TTP AI Assist — 24/7 AI-powered virtual tutor for instant help
  • 1,200+ flashcards + AI-powered study assistant & daily calendar
  • OnDemand, LiveTeach & GMAT Bootcamp formats available
  • Also: GRE, SAT Math & Executive Assessment courses
  • MBA Admissions Consulting now available
  • 🏆 2025 EdTech Breakthrough Award: Test Prep Solution Provider of the Year
  • 200,000+ students served
  • 5-day free trial — $0 to start, no auto-billing, cancel anytime
★★★★★ 5.0 (559 reviews)
130-pt guarantee
$0 to start then $127/mo
Start Free 5-Day Trial Read 559 Reviews →

Question Exponents

Expert replies
Post new topic Post Reply
Previous Topic Next Topic
Source: — Problem Solving |
Legendary Member
Posts: 829
Joined: Mon Jul 07, 2008 10:09 pmFollowed by: 3 members
Location: INDIA
Thanked: 84 times

by sudhir3127 » Wed Jul 16, 2008 10:56 pm
can u post the question .. i am not being able to see the picture.
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Legendary Member
Posts: 1153
Joined: Wed Jun 20, 2007 6:21 amFollowed by: 2 members
Thanked: 146 times

Re: Question Exponents

by parallel_chase » Thu Jul 17, 2008 2:36 am
ajmoney09 wrote:Image

No idea.

I divided by two to end up with 2^x - 2^x-1 = 3^13

Don't know what to do after that....OA is D

Help,
Thanks,
AJ.
2^x - 2^x-2 = 3(2^13)


2^x - 2^x/2^2
2^x(1-1/2^2) => 2^x (3/4)

=> 3(2^x-2) = 3 (2^13)


therefore x =15

Let me know if you have any questions.
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Legendary Member
Posts: 661
Joined: Tue Jul 08, 2008 12:58 pm
Location: France
Thanked: 48 times

by pepeprepa » Thu Jul 17, 2008 6:04 am
When you have this kind of equation, just factorize the left side by 2^x
You have to know that 2^(-x)=1/(2^x) and it's ok
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Junior | Next Rank: 30 Posts
Posts: 10
Joined: Thu May 15, 2008 2:41 am
Location: India

by anksanks » Thu Jul 17, 2008 6:44 am
2^x – 2^(x-2) = 3 * (2^13)
=> 2^x (1 – 1 / 2^2) = 3 * (2^13)
=> 2^x (3/4) = 3 * (2^13)
=> 2^x = 4 * (2^13) = 2^2 * (2^13) = 2^(13+2)=2^15
=> 2^x=2^15
=>x = 15
Shape me with your bounds,
Wrap me all around,
Define this adorable thought,
And break the silence.
(c) Anks
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Post new topic Post Reply
• Page 1 of 1