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

 It is currently 20 Nov 2018, 13:53

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

Events & Promotions

Events & Promotions in November
PrevNext
SuMoTuWeThFrSa
28293031123
45678910
11121314151617
18192021222324
2526272829301
Open Detailed Calendar
• All GMAT Club Tests are Free and open on November 22nd in celebration of Thanksgiving Day!

November 22, 2018

November 22, 2018

10:00 PM PST

11:00 PM PST

Mark your calendars - All GMAT Club Tests are free and open November 22nd to celebrate Thanksgiving Day! Access will be available from 0:01 AM to 11:59 PM, Pacific Time (USA)
• Free lesson on number properties

November 23, 2018

November 23, 2018

10:00 PM PST

11:00 PM PST

Practice the one most important Quant section - Integer properties, and rapidly improve your skills.

If x and y are both positive then √72x^3y^16 =

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

Hide Tags

Math Expert
Joined: 02 Sep 2009
Posts: 50711
If x and y are both positive then √72x^3y^16 =  [#permalink]

Show Tags

18 Oct 2018, 00:37
00:00

Difficulty:

35% (medium)

Question Stats:

67% (01:11) correct 33% (01:22) wrong based on 49 sessions

HideShow timer Statistics

If x and y are both positive then $$\sqrt{72x^3y^{16}} =$$

A. $$8xy^8\sqrt{2x}$$

B. $$6xy^4\sqrt{2x}$$

C. $$6xy^8\sqrt{2x}$$

D. $$6y^4\sqrt{8x}$$

E. $$9xy^8\sqrt{8x}$$

_________________
Director
Joined: 19 Oct 2013
Posts: 502
Location: Kuwait
GPA: 3.2
WE: Engineering (Real Estate)
Re: If x and y are both positive then √72x^3y^16 =  [#permalink]

Show Tags

18 Oct 2018, 08:38
1
Bunuel wrote:
If x and y are both positive then $$\sqrt{72x^3y^16} =$$

A. $$8xy^8\sqrt{2x}$$

B. $$6xy^4\sqrt{2x}$$

C. $$6xy^8\sqrt{2x}$$

D. $$6y^4\sqrt{8x}$$

E. $$9xy^8\sqrt{8x}$$

hi Bunuel I think the $$y^1$$should be y^16 there seems to be a typo

$$72 = 2^3 * 3^2$$

Once rearranged it can be $$2^2 * 2^1 * 3^2 * x^2 * x^1 * y^16$$

Taking the square root of that we get $$2*3*x*y^8 * \sqrt{2x}$$ = $$6xy^8 *\sqrt{2x}$$

Director
Joined: 27 May 2012
Posts: 615
Re: If x and y are both positive then √72x^3y^16 =  [#permalink]

Show Tags

05 Nov 2018, 10:14
1
Bunuel wrote:
If x and y are both positive then $$\sqrt{72x^3y^16} =$$

A. $$8xy^8\sqrt{2x}$$

B. $$6xy^4\sqrt{2x}$$

C. $$6xy^8\sqrt{2x}$$

D. $$6y^4\sqrt{8x}$$

E. $$9xy^8\sqrt{8x}$$

Dear Moderator,
There seems to be a small typo in the above question, for Y to be taken out of the square root as available in the answer choices , Y should have been raised to an even power in the question. Hope you will look into this. Thank you.
_________________

- Stne

Math Expert
Joined: 02 Sep 2009
Posts: 50711
Re: If x and y are both positive then √72x^3y^16 =  [#permalink]

Show Tags

05 Nov 2018, 10:16
stne wrote:
Bunuel wrote:
If x and y are both positive then $$\sqrt{72x^3y^16} =$$

A. $$8xy^8\sqrt{2x}$$

B. $$6xy^4\sqrt{2x}$$

C. $$6xy^8\sqrt{2x}$$

D. $$6y^4\sqrt{8x}$$

E. $$9xy^8\sqrt{8x}$$

Dear Moderator,
There seems to be a small typo in the above question, for Y to be taken out of the square root as available in the answer choices , Y should have been raised to an even power in the question. Hope you will look into this. Thank you.

Fixed that. As always, thank you for noticing.
_________________
Re: If x and y are both positive then √72x^3y^16 = &nbs [#permalink] 05 Nov 2018, 10:16
Display posts from previous: Sort by

If x and y are both positive then √72x^3y^16 =

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

 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®.