It is currently 12 Dec 2018, 06:34

### 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

# g(x) = x2 – 4 and g(c) = 12. If c < 0, what is the value of

Author Message
TAGS:
GMAT Club Legend
Joined: 07 Jun 2014
Posts: 4749
GRE 1: Q167 V156
WE: Business Development (Energy and Utilities)
Followers: 93

Kudos [?]: 1656 [0], given: 396

g(x) = x2 – 4 and g(c) = 12. If c < 0, what is the value of [#permalink]  30 Jul 2018, 09:52
Expert's post
00:00

Question Stats:

50% (00:30) correct 50% (00:00) wrong based on 2 sessions
$$g(x) = x^2 - 4$$ and $$g(c) = 12$$. If c < 0, what is the value of $$g(c - 2)$$?

[Reveal] Spoiler: OA
32

_________________

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

Try our free Online GRE Test

GMAT Club Legend
Joined: 07 Jun 2014
Posts: 4749
GRE 1: Q167 V156
WE: Business Development (Energy and Utilities)
Followers: 93

Kudos [?]: 1656 [0], given: 396

Re: g(x) = x2 – 4 and g(c) = 12. If c < 0, what is the value of [#permalink]  02 Aug 2018, 06:37
Expert's post
Explanation

For the function $$g(x) = x^2 - 4$$, plugging c in for x gives the answer 12. Thus:

$$c^2 - 4 = 12$$
$$c^2 = 16$$
$$c = 4$$ or $$-4$$

The problem indicates that c < 0, so c must be –4.

The problem then asks for $$g(c - 2)$$. Since $$c = -4$$, $$c - 2 = -6$$.

Plug –6 into the function:

$$g(-6) = (-6)^2 - 4$$

$$g(-6) = 36 - 4 = 32$$
_________________

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

Try our free Online GRE Test

Re: g(x) = x2 – 4 and g(c) = 12. If c < 0, what is the value of   [#permalink] 02 Aug 2018, 06:37
Display posts from previous: Sort by