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Thanks GMATGuruNY ! This is the same process I did (looking on the discriminante), I thought there is some other way because I think this is out of scope of GMAT. BUT I have news for you :-( this is actual (up-to-date) GMAT problem (not the exact numbers to avoid copyrights issues...) Also the GMAT ...

by eladoren

Sun Jan 09, 2011 1:49 am
Forum: GMAT Math
Topic: How do you determine if two lines intersect?
Replies: 12
Views: 78389

Nice observation Tani,
But do you have a more deterministic approach. I mean, if the equation instead of D was:
D. y = 4x^2+5x+3

What would you do? I have my own way but I want to see if there is simple way (I think mine is a little out of the scope of GMAT)

by eladoren

Sat Jan 08, 2011 2:28 am
Forum: GMAT Math
Topic: How do you determine if two lines intersect?
Replies: 12
Views: 78389

Here's another question:

In the XY-coordinate plane, which of the following does not intersect y = 2x^2 + 3x + 1?
A. y = x^2 + 2x + 2
B. y = 2x^2 + 5x + 2
C. y = 2x^2 + 7x + 2
D. y = 4x^2 + 6x + 3
E. y = 4x^2 + 8x + 4

by eladoren

Fri Jan 07, 2011 2:03 am
Forum: GMAT Math
Topic: How do you determine if two lines intersect?
Replies: 12
Views: 78389

First of all any two lines that are not parallel (does not have the same slope) will intersect at some point. Basically you need to take the two equations of the lines and equate them to see if you have a solution. So if you have the four points you mentioned, you need to build the two equations of ...

by eladoren

Thu Jan 06, 2011 2:01 pm
Forum: GMAT Math
Topic: How do you determine if two lines intersect?
Replies: 12
Views: 78389

Although the question is flawed, I think it is worthwhile to understand why None of the answers are/is (anyone knows ? the answer is both...hahah) correct. At least not looked like. C is the least worst. D has a problem in accept , should be to accept but then has a parallelism issue. In A,B,E the s...

by eladoren

Thu Jan 06, 2011 5:30 am
Forum: Sentence Correction
Topic: Comparison issues
Replies: 46
Views: 21281

Hi Amit, the original sentence is: Many of them chiseled from solid rock centuries ago, the mountainous regions of northern Ethiopia are dotted with hundreds of monasteries . (A) Many of them chiseled from solid rock centuries ago, the mountainous regions of northern Ethiopia are dotted with hundred...

by eladoren

Tue Jan 04, 2011 3:04 am
Forum: Sentence Correction
Topic: Objective Pronoun
Replies: 3
Views: 1076

Well everything is correct except "20% of leaf and small-stem is singular because Y part, leaf and small-stem, is singular." this is the major problem in the sentence as you can read in the comments. It's not so trivial to see it is singular. (the word 'and' is joining two singular nouns to plural o...

by eladoren

Tue Dec 07, 2010 9:53 am
Forum: Sentence Correction
Topic: Alfalfa
Replies: 19
Views: 6089

This is not true since when using sums of money, periods of time, distances and statistical data (like percents) you have to use much/less
As much as 20 percent of the people ARE going to vote to...

by eladoren

Sun Dec 05, 2010 2:36 am
Forum: Sentence Correction
Topic: Alfalfa
Replies: 19
Views: 6089

regarding question #32 The answer 170 is not correct in my opinion. it should be 171 the suggested solution is not considering the diagonal between the two neighbors of the un-attached vertex. The calculation should be the complete graph on 21 vertices and then remove 18 vertices : 1/2*(21*18)-18=17...

by eladoren

Wed Oct 06, 2010 12:34 pm
Forum: GMAT Math
Topic: Probability and Combination Problems
Replies: 16
Views: 47765