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OA is given x2suresh

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OA is given x2suresh

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
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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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by sanju09 » Fri Feb 27, 2009 6:26 am
DanaJ wrote::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.... "): 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 B-)
The mind is everything. What you think you become. -Lord Buddha



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The Princeton Review - Manya Abroad
Lucknow-226001

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