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by fighting_cax
Thu Apr 23, 2009 6:02 am
 
Forum: Manhattan Prep GMAT Non-CAT Math
Topic: Nov 3 question from difficult question bank
Replies: 6
Views: 2386
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Nov 3 question from difficult question bank

If p, x, and y are positive integers, y is odd, and p = x2 + y2, is x divisible by 4?

(1) When p is divided by 8, the remainder is 5.

(2) x - y = 3

I got lost in the explanation involving the quadratic formula. Can someone please explain.
by fighting_cax
Sat May 09, 2009 4:11 am
 
Forum: GMAT Official Practice Test Math
Topic: At what point does y=(x+a)(x+b) intersect x-axis?
Replies: 5
Views: 5395
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Re: At what point does y=(x+a)(x+b) intersect x-axis?

-- the rest of the analysis is correct; the problem winds up as x^2 - x - 6 = 0, an equation that factors to (x - 3)(x + 2) = 0 and has the two solutions x = 3 and x = -2. I have reached up to this point in the computation. Given that the equation has 2 solutions, shouldn't the answer be E instead?...
by fighting_cax
Sat May 16, 2009 1:44 am
 
Forum: Manhattan Prep GMAT Non-CAT Math
Topic: Nov 3 question from difficult question bank
Replies: 6
Views: 2386
Jump to post

Re: Nov 3 question from difficult question bank

Hi, Apologies for the delayed response. Also, question is from Oct 27, not Nov 3. Anyway, here's the explaination I can't quite understand: Statement (1): SUFFICIENT. We know that p is odd. We know from the problem stem that y is odd, which means that y2 is odd. Therefore, x2 must be even (because O...