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Re: ....

by parallel_chase » Wed Jul 16, 2008 12:26 pm
notgoodinmath wrote:If x(squared)+7x-3=4
what is the absolute value of lp-ql?
Are you sure about the question?
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Re: ....

by beeparoo » Thu Jul 17, 2008 3:31 pm
notgoodinmath wrote:If x(squared)+7x-3=4
what is the absolute value of lp-ql?
I think "notgoodinmath" is pulling a fast one on us..

Ha ha. Made me laugh though. Oh irony...
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by spanlength » Fri Jul 18, 2008 2:15 am
i think that p and q are the 2 roots of the equation which he has missed to write while posting.
If we assume that p and q are the 2 roots of the equation then the answer goes as follows:

x^2 + 7x -3 = 4
=> x^2 + 7x -7 = 0
hence the roots are [-7+sqrt(7^2 - 4*1*(-7))]/2*1 and [-7-sqrt(7^2 - 4*1*(-7))]/2*1

hence [-7 + sqrt(77)]/2 and [-7 -sqrt(77)]/2 .
so |p-q| = [-7 +sqrt(77) +7 + sqrt(77)]/2 = 2* sqrt(77)/2 = sqrt(77)
Hope this is the answer that notgoodinmath was looking for.
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by sudhir3127 » Fri Jul 18, 2008 5:12 am
Even i think we shud use

[-b+/-Sqrt(b^2-4ac)]/2a
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by notgoodinmath » Fri Jul 18, 2008 9:52 am
I actually got this question on my gmat test and like you guys I was :roll: ....some answers I received in other websites tell me this:
x (squared) is the constat variable p= 1
and q is -3 + (-4)= -7
so the absolute value of lp-ql=8
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by Stuart@KaplanGMAT » Fri Jul 18, 2008 10:00 am
notgoodinmath wrote:I actually got this question on my gmat test and like you guys I was :roll: ....some answers I received in other websites tell me this:
x (squared) is the constat variable p= 1
and q is -3 + (-4)= -7
so the absolute value of lp-ql=8
That's crazytalk!

There's no set accepted mathematical definition along those lines. I refuse to believe that the question, as written, appears on the GMAT, if for no other reason than it's redundant (you'd never write out "absolute value" and also use the |x| notation - that's like saying "what's the positive value of +4").
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by notgoodinmath » Fri Jul 18, 2008 11:08 am
that was my bad- I was just trying to make sure ppl knew it was the absolute value-sorry
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by Stuart@KaplanGMAT » Fri Jul 18, 2008 3:37 pm
notgoodinmath wrote:that was my bad- I was just trying to make sure ppl knew it was the absolute value-sorry
Are you sure that the question didn't start with something like:

"If p and q are the roots of ...."?

Without such a statement, p and q are undefined - I'm really finding it hard to believe that the GMAT would have such an ambiguous question.
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by notgoodinmath » Mon Jul 21, 2008 12:12 pm
100% positive it started off straight into the quadratic equation
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by resumes » Sun Dec 14, 2008 7:26 am
thanks, everyone
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