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In the expansion of (x - √x - 7)^7, what is the coefficient of x^(5/2)

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In the expansion of (x - √x - 7)^7, what is the coefficient of x^(5/2)  [#permalink]

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New post 05 Oct 2018, 09:41
In the expansion of (x - √x - 7)^7, what is the coefficient of x^(5/2)?
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Re: In the expansion of (x - √x - 7)^7, what is the coefficient of x^(5/2)  [#permalink]

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New post 07 Oct 2018, 11:41
sleepingbeauty wrote:
In the expansion of (x - √x - 7)^7, what is the coefficient of x^(5/2)?


Did you get this from an actual GMAT problem? You may want to find that problem in the Problem Solving forum, if it's there already, or start a thread for it there if there isn't one.

The reason I ask, is that I haven't seen too many problems along these lines on the GMAT. This could be a really challenging GMAT problem - it doesn't use any terminology that's totally foreign to the GMAT - but it almost looks more like an algebra homework problem to me. :-D

You want to avoid practicing GMAT problems without answer choices in most situations, because the answer choices very often give you clues to the right answer - particularly on problems that look like they should have a lot of calculation.
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Re: In the expansion of (x - √x - 7)^7, what is the coefficient of x^(5/2) &nbs [#permalink] 07 Oct 2018, 11:41
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In the expansion of (x - √x - 7)^7, what is the coefficient of x^(5/2)

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