It is currently 17 Jun 2019, 22:44 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

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here. a = 5b^2 – 10b + 7 Question banks Downloads My Bookmarks Reviews Important topics
Author Message
TAGS:
Founder Joined: 18 Apr 2015
Posts: 6885
Followers: 114

Kudos [?]: 1338 , given: 6306

a = 5b^2 – 10b + 7 [#permalink]
Expert's post 00:00

Question Stats: 62% (01:15) correct 37% (01:57) wrong based on 75 sessions

a = $$5b^2$$ – 10b + 7

 Quantity A Quantity B a b

A) Quantity A is greater.
B) Quantity B is greater.
C) The two quantities are equal.
D) The relationship cannot be determined from the information given.
[Reveal] Spoiler: OA

_________________ Intern Joined: 08 Dec 2017
Posts: 40
Followers: 1

Kudos [?]: 43  , given: 70

Re: a = 5b^2 – 10b + 7 [#permalink]
2
KUDOS
a = 5b^2 – 10b + 7
let b=0, so a=7
b=1, a= 2
b=-1, a=22
So Q.A is greater. Manager Joined: 15 Feb 2018
Posts: 53
Followers: 1

Kudos [?]: 18  , given: 33

Re: a = 5b^2 – 10b + 7 [#permalink]
2
KUDOS
a = 5b^2 - 10b + 7
Subtract b from both sides
a - b = 5b^2 - 11b + 7
Since the coefficient of b^2 is positive the RHS is >0.

So a-b>0 --> a>b.

Intern Joined: 17 Feb 2018
Posts: 9
Followers: 0

Kudos [?]: 2 , given: 2

Re: a = 5b^2 – 10b + 7 [#permalink]
gremather wrote:
a = 5b^2 - 10b + 7
Subtract b from both sides
a - b = 5b^2 - 11b + 7
Since the coefficient of b^2 is positive the RHS is >0.

So a-b>0 --> a>b.

great approach, didn't think of that Intern Joined: 11 Jan 2018
Posts: 44
Followers: 0

Kudos [?]: 37  , given: 7

Re: a = 5b^2 – 10b + 7 [#permalink]
3
KUDOS
It's a good question.

First need to simplify and then plugin as below:

Quantity A: $$5b^2$$ – 10b + 7
Quantity B: b

So, we can add 10b on both Quantities, because the inequality will not change i.e:

Quantity A: $$5b^2$$ + 7
Quantity B: 11b

Now, don't plugin -ve values, because Quantity A will always greater (being positive). Also in 0, Quantity A will be greater.
Finally, just check for positive values. You will see Again, Quantity A always greater.
For positive values, just plugin one value from (0 - 1) and other one from any value greater than 1.

Choice Choice A is correct.
_________________

Persistence >>>>>>> Success

Don't say thanks, just give KUDOS.
1 kudos = 1000 Thanks Re: a = 5b^2 – 10b + 7   [#permalink] 01 Mar 2018, 05:25
Display posts from previous: Sort by

a = 5b^2 – 10b + 7 Question banks Downloads My Bookmarks Reviews Important topics Powered by phpBB © phpBB Group Kindly note that the GRE® test is a registered trademark of the Educational Testing Service®, and this site has neither been reviewed nor endorsed by ETS®.
{"ft_lang_label":"__label__en","ft_lang_prob":0.7774353,"math_prob":0.8886995,"size":685,"snap":"2019-26-2019-30","text_gpt3_token_len":187,"char_repetition_ratio":0.16740088,"word_repetition_ratio":0.0,"special_character_ratio":0.30948904,"punctuation_ratio":0.16901408,"nsfw_num_words":0,"has_unicode_error":false,"math_prob_llama3":0.953714,"pos_list":[0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44],"im_url_duplicate_count":[null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null],"WARC_HEADER":"{\"WARC-Type\":\"response\",\"WARC-Date\":\"2019-06-18T06:44:18Z\",\"WARC-Record-ID\":\"<urn:uuid:abd1d1ca-3e9e-44b5-81a5-884146ede732>\",\"Content-Length\":\"103682\",\"Content-Type\":\"application/http; msgtype=response\",\"WARC-Warcinfo-ID\":\"<urn:uuid:75936827-0251-403d-b719-11a927b496a3>\",\"WARC-Concurrent-To\":\"<urn:uuid:d3d00c88-b471-4351-ae55-1abf1c4ceaa2>\",\"WARC-IP-Address\":\"198.11.238.98\",\"WARC-Target-URI\":\"https://greprepclub.com/forum/a-5b-2-10b-5649.html\",\"WARC-Payload-Digest\":\"sha1:VJMW3SA4HNH6DMLWKFVSJHEGLJW4LHNW\",\"WARC-Block-Digest\":\"sha1:W56WB45YCWPK6RBCASVAYAKKB4HRLQU3\",\"WARC-Identified-Payload-Type\":\"application/xhtml+xml\",\"warc_filename\":\"/cc_download/warc_2019/CC-MAIN-2019-26/CC-MAIN-2019-26_segments_1560627998690.87_warc_CC-MAIN-20190618063322-20190618085322-00519.warc.gz\"}"}