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

Redeem

help...

This topic has expert replies
Post new topic Post Reply
Previous Topic Next Topic
Source: — Problem Solving |
Senior | Next Rank: 100 Posts
Posts: 34
Joined: Sun Sep 03, 2006 6:00 am

by gamemaster » Sun Nov 19, 2006 7:20 am
Try this:

3^x-1 = (3^x)/3

3^x - 3^x-1 = 3^x - (3^x)/3 = (2 * 3^x)/3 = 162

=> x = ...
Top
User avatar
Senior | Next Rank: 100 Posts
Posts: 41
Joined: Fri Dec 15, 2006 9:23 am
Location: Greece
Followed by:1 members

by thankont » Tue Dec 19, 2006 8:38 am
You could work it out like this:
3^x-3^x-1=162 => 3^x-1*(3-1) = 162 => 3^x-1=81 =>3^x-1=3^4
so x-1=4 and x=5 and x(x-1)=20
Top
Post new topic Post Reply
• Page 1 of 1