It is currently 16 Feb 2019, 09:17

### 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 m > 0 and 3m2 + 12m – 15 = 0, then m =

Author Message
TAGS:
GRE Prep Club Legend
Joined: 07 Jun 2014
Posts: 4856
GRE 1: Q167 V156
WE: Business Development (Energy and Utilities)
Followers: 102

Kudos [?]: 1731 [0], given: 397

If m > 0 and 3m2 + 12m – 15 = 0, then m = [#permalink]  08 Apr 2018, 10:24
Expert's post
00:00

Question Stats:

100% (00:19) correct 0% (00:00) wrong based on 10 sessions
If m > 0 and $$3m^2 + 12m - 15 = 0$$, then m =

Drill 1
Question: 7
Page: 508

[Reveal] Spoiler: OA
1

_________________

Sandy
If you found this post useful, please let me know by pressing the Kudos Button

Try our free Online GRE Test

Intern
Joined: 02 Aug 2017
Posts: 24
Followers: 1

Kudos [?]: 13 [0], given: 4

Re: If m > 0 and 3m2 + 12m – 15 = 0, then m = [#permalink]  09 Apr 2018, 21:06
3m2+12m-15=0
m2+4m-5=0
(m+5)(m-1)=0
m=-5,1
since m>0, m=1 ANS.
Manager
Joined: 26 Jan 2018
Posts: 176
Followers: 0

Kudos [?]: 105 [1] , given: 3

Re: If m > 0 and 3m2 + 12m – 15 = 0, then m = [#permalink]  10 Apr 2018, 02:24
1
KUDOS
Factorization will give 2 possible values for m.

But as the question asks for only positive value, there is only one possible solution.

1
GRE Prep Club Legend
Joined: 07 Jun 2014
Posts: 4856
GRE 1: Q167 V156
WE: Business Development (Energy and Utilities)
Followers: 102

Kudos [?]: 1731 [0], given: 397

Re: If m > 0 and 3m2 + 12m – 15 = 0, then m = [#permalink]  15 Apr 2018, 05:32
Expert's post
Explanation

Factor the quadratic equation: $$(3m - 3)(m + 5) = 0$$.

Only the first factor gives a positive result: If $$3m - 3 = 0$$, then $$m = 1$$.

Alternately, you may notice that the equation is true if you ignore the variables, and making m = 1 would allow you to disregard them.
_________________

Sandy
If you found this post useful, please let me know by pressing the Kudos Button

Try our free Online GRE Test

Re: If m > 0 and 3m2 + 12m – 15 = 0, then m =   [#permalink] 15 Apr 2018, 05:32
Display posts from previous: Sort by