Data Sufficiency

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

That's odd.
Perhaps the person deleted his/her post while I was in the middle of responding to it.

Matt@VeritasPrep wrote: Yeah, I've never see that before! Your answer was so good it vaporized the original quandary.

If that were the case, you would have vaporized the entire website years ago!!!!

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.

If that were the case, you would have vaporized the entire website years ago!!!!

How do I send you Reddit gold for that?

Just leave it at the border, and I'll have someone pick it up

No problem!

Cheers,
Brent