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

Redeem

inequality problem

This topic has expert replies
Post new topic Post Reply
Previous Topic Next Topic
Senior | Next Rank: 100 Posts
Posts: 49
Joined: Fri Jul 24, 2009 5:18 am

inequality problem

by thailandvc » Sun Aug 09, 2009 10:15 pm
(X+1)^3 <= 64, What is the range?
Ans: Cuberoot [(x+1)^3] <= cuberoot (64) => Absolute value (X+1) <= 4

My question, I thought you can't divide by variables in equalities. Since you dont know if x+1 is positive or negative. If it is a square i understand but...
Top
Source: — Problem Solving |
Legendary Member
Posts: 752
Joined: Sun May 17, 2009 11:04 pm
Location: Tokyo
Thanked: 81 times
GMAT Score:680

by tohellandback » Sun Aug 09, 2009 10:19 pm
i am assuming we are to find the range of X.
I think we can't find it
max value will be 3.
there is no least value because for any negative value the cube will be <64
The powers of two are bloody impolite!!
Top
Post new topic Post Reply
• Page 1 of 1