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gmat 12th edition review book question

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gmat 12th edition review book question [#permalink]  06 Dec 2009, 08:32
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I'd like someone to double check a potential error in Official GMAT 12th Edition Review book.

page 123, section 5: Solving Equations by Factoring.

in the equation listed in this example problem, it appears to me that in the second step of factoring, the negative sign incorrectly turns into a positive sign within the left side of the equation. -2x squared turns into +2x squared. My calculations show that that it should remain -2x squared. Can someone double check this? I would appreciate it.

I hope someone will understand what I wrote above, I'm new to the forum and not sure yet how to write out equations on this message board.
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Re: gmat 12th edition review book question [#permalink]  06 Dec 2009, 11:55
srjonz wrote:
I'd like someone to double check a potential error in Official GMAT 12th Edition Review book.

page 123, section 5: Solving Equations by Factoring.

in the equation listed in this example problem, it appears to me that in the second step of factoring, the negative sign incorrectly turns into a positive sign within the left side of the equation. -2x squared turns into +2x squared. My calculations show that that it should remain -2x squared. Can someone double check this? I would appreciate it.

I hope someone will understand what I wrote above, I'm new to the forum and not sure yet how to write out equations on this message board.

Can you post the question in detail?
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Re: gmat 12th edition review book question [#permalink]  06 Dec 2009, 12:02
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srjonz wrote:
I'd like someone to double check a potential error in Official GMAT 12th Edition Review book.

page 123, section 5: Solving Equations by Factoring.

in the equation listed in this example problem, it appears to me that in the second step of factoring, the negative sign incorrectly turns into a positive sign within the left side of the equation. -2x squared turns into +2x squared. My calculations show that that it should remain -2x squared. Can someone double check this? I would appreciate it.

I hope someone will understand what I wrote above, I'm new to the forum and not sure yet how to write out equations on this message board.

You are correct. It is a typo, but it has been corrected in the step 3 again.
Re: gmat 12th edition review book question   [#permalink] 06 Dec 2009, 12:02
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