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

Redeem

Target Test Prep · GMAT

Choose how you want to prepare

Learn live with an expert or move at your own pace. Every option includes the complete TTP study system.

★★★★★5.0559 reviews
GMATLiveTeach 7 seats left
Chris Peckover
NEXT LIVE COHORT

Oct 13 to Jan 7, 2027

with Chris Peckover

Schedule
Tue, Thu · 8:00 to 10:00 PM ET
Included
40 live hours + 6 months of GMAT OnDemand
  • Live instruction and real-time questions
  • Class recordings and assigned practice
View class & enroll
Limited cohort · enrollment openTarget Test Prep
EALiveTeach 5 seats left
Logan Thompson
EXECUTIVE ASSESSMENT

Sep 6 to Dec 6, 2026

with Logan Thompson

Schedule
Sun · 9:30 AM to 12:30 PM ET
Included
Live EA class + 6 months of EA OnDemand
  • Expert-led weekly online sessions
  • EA Masterclass access between classes
View EA class & enroll
Limited cohort · enrollment openTarget Test Prep
GMATOnDemand Start anytime
SELF-PACED MASTERCLASS

Target Test Prep GMAT OnDemand

Complete access from day one. Study on your schedule.

130-point score guarantee
$0to start then $127/mo
  • Personalized study plan and analytics
  • Thousands of lessons and practice questions
Start free 5-day trial
Read 559 reviewsTarget Test Prep

Compare the format, schedule, and included access before enrolling. Prices and seat counts shown reflect the supplied offer details.

what do we do with exponents?

Expert replies
Post new topic Post Reply
Previous Topic Next Topic
Source: — Problem Solving |
Legendary Member
Posts: 1153
Joined: Wed Jun 20, 2007 6:21 amFollowed by: 2 members
Thanked: 146 times

by parallel_chase » Mon Aug 04, 2008 1:06 am
3^x - 3^x-1 = 162

first thing first factorize 162 = 2*(3)^4


3^x - 3^x-1
3^x - (3^x/3)
(3*3^x - 3^x)/3
[3^x (3-1)]/3

[3^x * 2]/3 = 2*(3)^4

x=5

x(x-1) = 5(5-1)=5*4 =20

Hope this helps.
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Master | Next Rank: 500 Posts
Posts: 222
Joined: Fri Jan 04, 2008 8:10 pm
Thanked: 15 times

by sibbineni » Mon Aug 04, 2008 3:16 am
3^x - 3^x-1 = 162


prime factors of 162=3^4*2

3^x-3^x-1=3^4*2

here apply the formula a^m-n=a^m/a^n

3^x-3^x/3=3^4*2

now take 3^x as common from LHS

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

3^x*2/3=3^4*2

3^x*2=3^4*2*3

3^x=3^4*3

3^x=3^5

x=5

then x(x-1)=

5(5-1)=20

hope this clears up
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Legendary Member
Posts: 574
Joined: Sun Jun 01, 2008 8:48 am
Location: Bangalore
Thanked: 28 times

by vishubn » Tue Aug 05, 2008 10:18 am
3^x-3^x/3=162
3(3^x)-3^x=162*3

3^x(3-1)162*3
3^x=3^4*3
3^x=3^5
x=5

then x(x-1) =20

Vishu

hope this helps
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Post new topic Post Reply
• Page 1 of 1