GMAT Question of the Day - Daily to your Mailbox; hard ones only

 It is currently 21 Jul 2018, 04:07

### GMAT Club Daily Prep

#### Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

# If y^3 = y – 1, then y - 1/(1 - y^2) =

 new topic post reply Question banks Downloads My Bookmarks Reviews Important topics
Author Message
TAGS:

### Hide Tags

Math Expert
Joined: 02 Sep 2009
Posts: 47161
If y^3 = y – 1, then y - 1/(1 - y^2) =  [#permalink]

### Show Tags

19 Sep 2017, 00:52
00:00

Difficulty:

25% (medium)

Question Stats:

85% (01:27) correct 15% (02:00) wrong based on 41 sessions

### HideShow timer Statistics

If $$y^3 = y – 1$$, then $$y - \frac{1}{1 - y^2}=$$

A. -1
B. 1
C. 1.5
D. 2.5
E. 0

_________________
Director
Joined: 18 Aug 2016
Posts: 631
Concentration: Strategy, Technology
GMAT 1: 630 Q47 V29
GMAT 2: 740 Q51 V38
Re: If y^3 = y – 1, then y - 1/(1 - y^2) =  [#permalink]

### Show Tags

19 Sep 2017, 01:16
1
Bunuel wrote:
If $$y^3 = y – 1$$, then $$y - \frac{1}{1 - y^2}=$$

A. -1
B. 1
C. 1.5
D. 2.5
E. 0

Given
$$y^3 - y = – 1$$
$$y-y^3 = 1$$

$$y - \frac{(1)}{(1 - y^2)}$$
$$\frac{(y-y^3-1)}{(1-y^2)}$$
$$\frac{(1-1)}{(1-y^2)} = 0$$

E
_________________

We must try to achieve the best within us

Thanks
Luckisnoexcuse

Director
Status: Preparing for GMAT
Joined: 25 Nov 2015
Posts: 675
Location: India
GPA: 3.64
Re: If y^3 = y – 1, then y - 1/(1 - y^2) =  [#permalink]

### Show Tags

19 Sep 2017, 02:34
Bunuel wrote:
If $$y^3 = y – 1$$, then $$y - \frac{1}{1 - y^2}=$$

A. -1
B. 1
C. 1.5
D. 2.5
E. 0

y - $$\frac{1}{(1-y^2)}$$ = $$\frac{y * (1-y^2) -1}{(1-y^2)}$$
= $$\frac{(y-y^3-1)}{(1-y^2)}$$
= $$\frac{(y^3-y^3)}{(1-y^2)}$$
= 0

Please press kudos, if u liked my post!

_________________

Please give kudos, if you like my post

When the going gets tough, the tough gets going...

Re: If y^3 = y – 1, then y - 1/(1 - y^2) = &nbs [#permalink] 19 Sep 2017, 02:34
Display posts from previous: Sort by

# If y^3 = y – 1, then y - 1/(1 - y^2) =

 new topic post reply Question banks Downloads My Bookmarks Reviews Important topics

# Events & Promotions

 Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.