I was reviewing all my math concepts and found this in OG11, : Quant Question Archive [LOCKED]
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# I was reviewing all my math concepts and found this in OG11,

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I was reviewing all my math concepts and found this in OG11, [#permalink]

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04 Dec 2007, 23:20
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

I was reviewing all my math concepts and found this in OG11, page 123, chapter 4.2.5.

In the equation towards the bottom of the page, they have:

x(x^2+2x+1)+5(x-1)^2=0
x(x-1)^2+5(x-1)^2=0

Shouldn't this be:
x(x+1)^2+5(x-1)^2=0 ?
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Re: is it too late to be studying or OG made a mistake? [#permalink]

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04 Dec 2007, 23:43
asdert wrote:
I was reviewing all my math concepts and found this in OG11, page 123, chapter 4.2.5.

In the equation towards the bottom of the page, they have:

x(x^2+2x+1)+5(x-1)^2=0
x(x-1)^2+5(x-1)^2=0

Shouldn't this be:
x(x+1)^2+5(x-1)^2=0 ?

lets see (x-1)(x-1) --> x^2-2x+1 so.... ya this can be right.

I can't check the actual page though. I lent out my OG.
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Re: is it too late to be studying or OG made a mistake? [#permalink]

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05 Dec 2007, 00:07
asdert wrote:
I was reviewing all my math concepts and found this in OG11, page 123, chapter 4.2.5.

In the equation towards the bottom of the page, they have:

x(x^2+2x+1)+5(x-1)^2=0
x(x-1)^2+5(x-1)^2=0

Shouldn't this be:
x(x+1)^2+5(x-1)^2=0 ?

per your posting, yoou are correct but you missed the eq. earler to this one. there is a typo in OG in eq "x(x^2+2x+1)+5(x-1)^2=0. it should be x(x^2-2x+1)+5(x-1)^2=0
Re: is it too late to be studying or OG made a mistake?   [#permalink] 05 Dec 2007, 00:07
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