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 →

If x^3 * y^6 * z^9 < 0, which of the following must be tr

Expert replies
Post new topic Post Reply
Previous Topic Next Topic
User avatar
Official Company Rep
Posts: 37
Joined: Sat Jun 27, 2009 4:04 pmFollowed by: 4 members
Location: Berkeley, CA
Thanked: 2 times
GMAT Score:760
by hansoo » Sun Sep 06, 2009 1:36 pm
If x^3 * y^6 * z^9 < 0, which of the following must be true?

I. xy < 0
II. yz < 0
III. xz < 0

a) I only
b) II only
c) III only
d) I and II only
e) I and III only
Hansoo Lee
Magoosh - GMAT Prep

MBA Student, Haas
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Source: — Problem Solving |
Master | Next Rank: 500 Posts
Posts: 256
Joined: Mon Aug 10, 2009 6:31 pm
Thanked: 3 times

by gmatv09 » Sun Sep 06, 2009 2:35 pm
IMO C
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Senior | Next Rank: 100 Posts
Posts: 85
Joined: Fri Jul 24, 2009 4:05 pm

by kbharadwaj.1987 » Sun Sep 06, 2009 3:00 pm
I didn't get it, could anyone explain it?
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
User avatar
Master | Next Rank: 500 Posts
Posts: 157
Joined: Tue Oct 07, 2008 5:47 am
Thanked: 3 times

by PussInBoots » Sun Sep 06, 2009 4:02 pm
x^3 * y^6 * z^9 < 0
(x * y^2 * z^3)^3 < 0
x * y^2 * z^3 < 0
x * z^3 < 0 (y^2 is non-negative)
x * z * z^2 < 0
xz <0

y could be whatever. As long as it's not zero, y^6 will be positive
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Senior | Next Rank: 100 Posts
Posts: 85
Joined: Fri Jul 24, 2009 4:05 pm

by kbharadwaj.1987 » Sun Sep 06, 2009 4:19 pm
oh thanks mate!
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
User avatar
Official Company Rep
Posts: 37
Joined: Sat Jun 27, 2009 4:04 pmFollowed by: 4 members
Location: Berkeley, CA
Thanked: 2 times
GMAT Score:760

by hansoo » Mon Sep 07, 2009 1:53 am
The official answer is C.

To view a video explanation, click here: GMAT video
Attachments
xyzisnegative_text.png
Hansoo Lee
Magoosh - GMAT Prep

MBA Student, Haas
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Post new topic Post Reply
• Page 1 of 1