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

Redeem

How are you Älgabra"skills? Try this!

This topic has expert replies
Post new topic Post Reply
Previous Topic Next Topic
Source: — Data Sufficiency |
Senior | Next Rank: 100 Posts
Posts: 82
Joined: Tue Mar 17, 2009 3:03 am
Thanked: 2 times
Followed by:1 members

by kyabe » Sat Sep 05, 2009 9:52 am
Answer should be C.

As 1 gives x = 2 and -3

and 2 gives x = -7 and 2

Combining both we get x = 2
Top
Senior | Next Rank: 100 Posts
Posts: 60
Joined: Sat May 30, 2009 11:22 am
Thanked: 2 times

Re: How are you Älgabra"skills? Try this!

by qwe12 » Sun Sep 06, 2009 12:06 am
EbrahimHashem wrote:What is the value of x ?

(1) x^3 = 6x - x^2
(2) 14x = x^3 + 5x^2

HAVE FUN! :D
(1) gives us x=0,-3,2
(2) gives us x=0,2,7

from (1) and (2) we get x=0,2

since the question asks what *is* (singular) the value of x, the answer must be (E), since from neither (1) or (2) can we get one single value for x.

(E)
Top
Junior | Next Rank: 30 Posts
Posts: 29
Joined: Mon Mar 09, 2009 6:39 am

Re: How are you Älgabra"skills? Try this!

by EbrahimHashem » Sun Sep 06, 2009 11:55 am
qwe12 wrote:
EbrahimHashem wrote:What is the value of x ?

(1) x^3 = 6x - x^2
(2) 14x = x^3 + 5x^2

HAVE FUN! :D
(1) gives us x=0,-3,2
(2) gives us x=0,2,7

from (1) and (2) we get x=0,2

since the question asks what *is* (singular) the value of x, the answer must be (E), since from neither (1) or (2) can we get one single value for x.

(E)
Your answer is correct! but what's wrong with the first answer provided by"kyabe"? is there anything we both are missing?
Top
Senior | Next Rank: 100 Posts
Posts: 82
Joined: Tue Mar 17, 2009 3:03 am
Thanked: 2 times
Followed by:1 members

Re: How are you Älgabra"skills? Try this!

by kyabe » Sun Sep 06, 2009 12:00 pm
EbrahimHashem wrote:
qwe12 wrote:
EbrahimHashem wrote:What is the value of x ?

(1) x^3 = 6x - x^2
(2) 14x = x^3 + 5x^2

HAVE FUN! :D
(1) gives us x=0,-3,2
(2) gives us x=0,2,7

from (1) and (2) we get x=0,2

since the question asks what *is* (singular) the value of x, the answer must be (E), since from neither (1) or (2) can we get one single value for x.

(E)
Your answer is correct! but what's wrong with the first answer provided by"kyabe"? is there anything we both are missing?
Ebrahim the answer posted by qwe12 should be correct as when I used deduced the solution I cancelled x from LHS and RHS. Now when we cancel X, 0 can be one of the factors. And as said by qwe12 after combining i and ii we are left with two values of x ie 0 and 2. Hence its E. Does that makes sense?
Top
Junior | Next Rank: 30 Posts
Posts: 29
Joined: Mon Mar 09, 2009 6:39 am

by EbrahimHashem » Sun Sep 06, 2009 12:47 pm
I'm not sure whether I understand what you are saying :roll: Can you please elaborate on this?
Top
Senior | Next Rank: 100 Posts
Posts: 82
Joined: Tue Mar 17, 2009 3:03 am
Thanked: 2 times
Followed by:1 members

by kyabe » Sun Sep 06, 2009 12:57 pm
From i) The factors are 0,2,-3
From ii) The factors are 0,2,-7

Combining these we get two factors of X ie 0 and 2.

Since we can't say that only one value of x will satisfy both the equations as there are two values 0 and 2. The answer is E
Top
Post new topic Post Reply
• Page 1 of 1