Target Test Prep 20% Off Flash Sale is on! Code: FLASH20

Redeem
Target Test Prep
5-Day Free Trial
5-day free, full-access trial TTP

Available with Beat the GMAT members only code

MORE DETAILS
Target Test Prep
Magoosh
Magoosh
Study with Magoosh GMAT prep

Available with Beat the GMAT members only code

MORE DETAILS
Magoosh

questoin from kaplan book

This topic has expert replies
Post new topic Post Reply
Previous Topic Next Topic
Master | Next Rank: 500 Posts
Posts: 131
Joined: Mon May 05, 2008 10:46 am
Thanked: 1 times

questoin from kaplan book

by Mclaughlin » Sat Aug 09, 2008 5:12 pm
what is the value of X

1. x^2 - 9 = 16
2. 3x(x-5) = 0

OA is C but I got B because I solved B and got a value for X.
Top
Master | Next Rank: 500 Posts
Posts: 222
Joined: Fri Jan 04, 2008 8:10 pm
Thanked: 15 times

by sibbineni » Sun Aug 10, 2008 8:09 pm
st1. x^2 - 9 = 16

x^2=25

x=+/-5 insuff
st2. 3x(x-5) = 0

3x=0 or (x-5)=0

x=0 or x=5

insuff


together(1) and (2)

x=5

sufficient
IMOC
Top
Legendary Member
Posts: 661
Joined: Tue Jul 08, 2008 12:58 pm
Location: France
Thanked: 48 times

by pepeprepa » Mon Aug 11, 2008 3:06 am
You cannot find an unique value of X with 2) only. Check your error.
Top
Post new topic Post Reply
• Page 1 of 1