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## Official Guide Explanation:

Problem Solving #111

**Background**

This is just one of hundreds of free explanations I've created to the quantitative questions in The Official Guide for GMAT Quantitative Review (2nd ed.). Click the links on the question number, difficulty level, and categories to find explanations for other problems.

These are the same explanations that are featured in my "Guides to the Official Guide" PDF booklets. However, because of the limitations of HTML and cross-browser compatibility, some mathematical concepts, such as fractions and roots, do not display as clearly online.

Click here for an example of the PDF booklets. Click here to purchase a PDF copy.

**Solution and Metadata**

**Question****: 111**

Page: 76

Difficulty: **6** (Moderately Difficult)

Category 1: Algebra > Simplifying Algebraic Expressions >

Category 2: Algebra > Equations >

**Explanation:** This question may look like simple algebra: to solve for x, multiply both sides by k. But there are traps awaiting the unwary, so be careful of all of the negative signs. To solve:

k - ((3 - 2k^{2})/(k)) = ((x)/(k))

k(k) - k(((3 - 2k^{2})/(k))) = x

x = k^{2}-(3 - 2k^{2}) = k^{2}-3 + 2k^{2} = 3k^{2}-3, choice (C).

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