OA is given x2suresh

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sanju09: GMAT Instructor; Posts: 3650; Joined: Wed Jan 21, 2009 4:27 amFollowed by: 80 members; Location: India; Thanked: 267 times; GMAT Score:760

by sanju09 » Fri Feb 27, 2009 6:08 am

[spoiler]Which expression below cannot equal zero when a^2 + a = 6?

A. a^2 − 4
B. a^2 − 9
C. a^2 − 4 a + 4
D. a^2 − 5 a + 6
E. a^2 − a − 6[/spoiler]

OA is E

The mind is everything. What you think you become. -Lord Buddha

Sanjeev K Saxena
Quantitative Instructor
The Princeton Review - Manya Abroad
Lucknow-226001

www.manyagroup.com

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Source: Beat The GMAT — Problem Solving | Fri Feb 27, 2009 6:08 am

DanaJ: Site Admin; Posts: 2567; Joined: Thu Jan 01, 2009 10:05 amFollowed by: 550 members; Thanked: 712 times; GMAT Score:770

by DanaJ » Fri Feb 27, 2009 6:19 am

:D funny one...
I'm sorry.... Maybe I did not explain it clearly enough... Use the spoiler function at the end of the post.
Anyhow, a^2 + a = 6 is a second degree equation:
a^2 + a - 6 = 0, with -3 and 2 as solutions.
With that in mind, we can check all equations and quickly see if -3 or 2 is among them:
A has solutions 2 and -2 - out
B has solutions 3 and -3 - out
C has solution 2 - out
D has solutions 2 and 3 - out
E has solutions 3 and -2 - correct.

Here is how you should do it with the spoiler (only that I'm not un-ticking that "Disable.... "): [spoiler]E[/spoiler]. Press once before the text you want to hide and again at the end of the text.

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sanju09: GMAT Instructor; Posts: 3650; Joined: Wed Jan 21, 2009 4:27 amFollowed by: 80 members; Location: India; Thanked: 267 times; GMAT Score:760

by sanju09 » Fri Feb 27, 2009 6:26 am

DanaJ wrote: funny one...
I'm sorry.... Maybe I did not explain it clearly enough... Use the spoiler function at the end of the post.
Anyhow, a^2 + a = 6 is a second degree equation:
a^2 + a - 6 = 0, with -3 and 2 as solutions.
With that in mind, we can check all equations and quickly see if -3 or 2 is among them:
A has solutions 2 and -2 - out
B has solutions 3 and -3 - out
C has solution 2 - out
D has solutions 2 and 3 - out
E has solutions 3 and -2 - correct.

Here is how you should do it with the spoiler (only that I'm not un-ticking that "Disable.... "): E. Press once before the text you want to hide and again at the end of the text.

Who knows who really is kidding, you are laughing, I am

The mind is everything. What you think you become. -Lord Buddha

Sanjeev K Saxena
Quantitative Instructor
The Princeton Review - Manya Abroad
Lucknow-226001

www.manyagroup.com

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krisraam: Master | Next Rank: 500 Posts; Posts: 221; Joined: Wed Jan 21, 2009 10:33 amFollowed by: 1 member; Thanked: 12 times

by krisraam » Fri Feb 27, 2009 6:51 am

Answer is E

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