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Lesson: Useful Contradictions - GMATPrepNow

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by Brent@GMATPrepNow » Fri Jan 22, 2016 11:47 am
g3lo wrote:Hi,

In Lesson: Useful Contradictions where it talks about quadratic equations.

It shows X^2 - 10x - 24 = (X-4x)(x-6x)

Is this an error?

As when you expand it you get; X^2-10X+24 (not -24)
You might want to watch the entire video.

The "error" is intentional.
This video (at https://www.gmatprepnow.com/module/gmat- ... video/1104) is meant to show you how the two statements in a DS question will never contradict each other.
This fact helps us identify the error in factoring x^2 - 10x - 24 to get (x-4)(x-6)
At 2:55 in the video, we make a second attempt at factoring the expression to get the CORRECT factorization of (x - 12)(x + 2)

Cheers,
Brent
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Source: — Data Sufficiency |
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by Matt@VeritasPrep » Fri Jan 22, 2016 3:40 pm
What happened to the rest of the thread?
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by Brent@GMATPrepNow » Fri Jan 22, 2016 3:46 pm
That's odd.
Perhaps the person deleted his/her post while I was in the middle of responding to it.
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by Matt@VeritasPrep » Fri Jan 22, 2016 3:55 pm
Brent@GMATPrepNow wrote:That's odd.
Perhaps the person deleted his/her post while I was in the middle of responding to it.
Yeah, I've never see that before! Your answer was so good it vaporized the original quandary. :D
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by Brent@GMATPrepNow » Fri Jan 22, 2016 3:59 pm
Matt@VeritasPrep wrote: Yeah, I've never see that before! Your answer was so good it vaporized the original quandary. :D
If that were the case, you would have vaporized the entire website years ago!!!!
:-)
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by Matt@VeritasPrep » Fri Jan 22, 2016 4:19 pm
Brent@GMATPrepNow wrote:
Matt@VeritasPrep wrote: Yeah, I've never see that before! Your answer was so good it vaporized the original quandary. :D
If that were the case, you would have vaporized the entire website years ago!!!!
:-)
How do I send you Reddit gold for that? :D
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by Brent@GMATPrepNow » Fri Jan 22, 2016 4:30 pm
Matt@VeritasPrep wrote:
Brent@GMATPrepNow wrote:
Matt@VeritasPrep wrote: Yeah, I've never see that before! Your answer was so good it vaporized the original quandary. :D
If that were the case, you would have vaporized the entire website years ago!!!!
:-)
How do I send you Reddit gold for that? :D
Just leave it at the border, and I'll have someone pick it up :-)
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by g3lo » Fri Jan 22, 2016 4:50 pm
Hi Brent,

Thank you very much for your answer. I was watching the video at my work computer. It randomly stopped which I thought it was finished. Hence, why I posted the question. I saw that there were no replies yet, so I edited the post and asked for it to be deleted.

I guess you your reply and my deletion was coincidentally at the same time.

Apologies,
g3lo
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by Brent@GMATPrepNow » Fri Jan 22, 2016 4:58 pm
No problem!

Cheers,
Brent
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