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# Which expression is equivalent to

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GMAT Club Legend
Joined: 07 Jun 2014
Posts: 4750
GRE 1: Q167 V156
WE: Business Development (Energy and Utilities)
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Kudos [?]: 1664 [0], given: 396

Which expression is equivalent to [#permalink]  03 Apr 2017, 03:01
Expert's post
00:00

Question Stats:

50% (01:06) correct 50% (01:08) wrong based on 10 sessions
Which expression is equivalent to $$\frac{1}{y - (1 \div y)}-y$$?

A. $$\frac{y^3 + y -1}{y^2 -1}$$

B. $$\frac{2y - y^3}{y^2 -1}$$

C. $$\frac{-y^3}{y^2 -1}$$

D. $$y^3 + y -1$$

E. $$- y -1$$

Drill 2
Question: 2
Page: 318
[Reveal] Spoiler: OA

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Sandy
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GMAT Club Legend
Joined: 07 Jun 2014
Posts: 4750
GRE 1: Q167 V156
WE: Business Development (Energy and Utilities)
Followers: 93

Kudos [?]: 1664 [0], given: 396

Re: Which expression is equivalent to [#permalink]  03 Apr 2017, 05:24
Expert's post
Explanation

This is a good problem for Plugging In. If y = 2, then the expression becomes equal to − $$\frac{4}{3}$$. Choice B is the only choice that gives you − when you replace y with 2.

Hence option B is correct.
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Sandy
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Re: Which expression is equivalent to   [#permalink] 03 Apr 2017, 05:24
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