[phpBB Debug] PHP Notice: in file /includes/viewtopic_mods/timer.php on line 168: array_key_exists() expects parameter 2 to be array, null given [phpBB Debug] PHP Notice: in file /includes/viewtopic_mods/timer.php on line 169: array_key_exists() expects parameter 2 to be array, null given [phpBB Debug] PHP Notice: in file /includes/viewtopic_mods/timer.php on line 170: array_key_exists() expects parameter 2 to be array, null given
M02 Q11 DS : Retired Discussions [Locked]

Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized for You

we will pick new questions that match your level based on your Timer History

Track Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice Pays

we will pick new questions that match your level based on your Timer History

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

It appears that you are browsing the GMAT Club forum unregistered!

Signing up is free, quick, and confidential.
Join other 350,000 members and get the full benefits of GMAT Club

Registration gives you:

Tests

Take 11 tests and quizzes from GMAT Club and leading GMAT prep companies such as Manhattan GMAT,
Knewton, and others. All are free for GMAT Club members.

Applicant Stats

View detailed applicant stats such as GPA, GMAT score, work experience, location, application
status, and more

Books/Downloads

Download thousands of study notes,
question collections, GMAT Club’s
Grammar and Math books.
All are free!

Thank you for using the timer!
We noticed you are actually not timing your practice. Click the START button first next time you use the timer.
There are many benefits to timing your practice, including:

The real question, then is this: is (p + q) (p-q) > 0 ? The statements taken together allow for p > q and p < q , which makes the sign either positive or negative.

I don't understand the answer. Could someone break it down further please?

The real question, then is this: is (p + q) (p-q) > 0 ? The statements taken together allow for p > q and p < q , which makes the sign either positive or negative. The correct answer is E.

I don't understand the answer. Could someone break it down further please?

p^2 - q^2 > 0

1) p>0

p^2 - q^2 ---> +ve when p>q (assume q is also positive) p^2 - q^2 ---> -ve ve when p<q (assume q is also positive)

two solutions insuffcient

2) q>0

p^2 - q^2 ---> +ve when p>q (assume p is also positive) p^2 - q^2 ---> -ve when p<q (assume p is also positive)

two solutions insuffcient

combine. p>0 q>0 AND DON'T know the proper relation between p and q p>q q>p

p^2 - q^2 --> lead +ve or -ve values depends on p>q or q>p insuffcient

E. _________________

Your attitude determines your altitude Smiling wins more friends than frowning

In order to know whether p^2 > q^2 we have to know something about the relationship between p and q -- that one is larger than the other, that one is negative and one is positive, that one is less than 1 and the other isn't, etc.

Neither of the two statements separately nor the two statements combined give you any information about this.

Actually I wouldn't take the pains of factorizing and all that .. keeping it simple

Square of any number is positive .. so unless the answer choices help establishing a relationship between p and q it's impossible to say which is greater. Hence the option E. _________________

In the land of the night, the chariot of the sun is drawn by the grateful dead

In order to know whether p^2 > q^2 we have to know something about the relationship between p and q -- that one is larger than the other, that one is negative and one is positive, that one is less than 1 and the other isn't, etc.

Neither of the two statements separately nor the two statements combined give you any information about this.

Enough said here. P and Q could be equal in each of the scenarios. No way to tell if they are not, so E

The real question, then is this: is (p + q) (p-q) > 0 ? The statements taken together allow for p > q and p < q , which makes the sign either positive or negative.

I don't understand the answer. Could someone break it down further please?

Looking at statement 1) we have information for P but not Q so I eliminated A & D off the bat. Looking at statement 2) we have information for Q but not for P so I eliminate B as well.

We are only left with C or E. Since P and Q are greater than 0 and there is no mention of integers in the problem I am going to test a low number 1 and a fraction .5

Here is what I have for my table, respectively..

P:1,.5,1,.5 Q:.5,1,1,.5

Putting these numbers in the original question I get the following... Yes, No, No, No

Cross out C since it is insufficient.

E all the way _________________

I'm trying to not just answer the problem but to explain how I came up with my answer. If I am incorrect or you have a better method please PM me your thoughts. Thanks!

since each statement alone is insufficient to answer, considering two statements together still not sufficient to answer as we do not whether P or Q is greater. For example : As both P and Q are positives , if P=2,Q=1, then P*P> Q*Q.

if P=1,Q= 2, then P*P<Q*Q. No definite answer, so it is insufficient to answer. answer is E

from question stem it is apparent that sign of variables does not have any impact on the solution since both p and q are squared its the absolute value that we are after of each variable

Both Statement 1 and 2 provide only the sign of the number, which is postive for both of them. None talks about absolute value. Hence neither alone nor together are they sufficient to answer the question

I think the best way to go about this is absolute value. Anything squared is the same as taking absolute value. A and B do not help. Putting them together doesn't either. E

a) even if we have p = pos, q^2 can still be suff or insuff (ie. p = 2, q = 1 or -3) b) even if we have q = pos, p^2 can still be suff or insuff (ie. q = 2, p = 1 or -3) d) we've shown both are insuff c) well we know both are pos, but if you test fractions or integers they can go either way.

The real question, then is this: is (p + q) (p-q) > 0 ? The statements taken together allow for p > q and p < q , which makes the sign either positive or negative.

I don't understand the answer. Could someone break it down further please?

Is p^2 > q^2 ?

Is p^2 > q^2 ? --> is |p|>|q|? So, the question basically asks whether p is further from zero, on a number line, than q.

(1) p > 0. Not sufficient since there is no info abut q. (2) q > 0. Not sufficient since there is no info abut p.

(1)+(2) We know that both p and q are positive, though we don't know which one is further from zero (we don't know their relative position on a number line). Not sufficient.

Since p and q can take the form of a + whole no. or a + fraction. And any of the numbers can be greater than the other. Considering p>q and that they are whole nos. will result in different conclusion if they are fractions.