GMAT Question of the Day: Daily via email | Daily via Instagram New to GMAT Club? Watch this Video

 It is currently 08 Apr 2020, 07:49

### 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 (√a − √b)(√a + √b) = 12, then what is a in terms of b?

Author Message
TAGS:

### Hide Tags

Math Expert
Joined: 02 Sep 2009
Posts: 62624
If (√a − √b)(√a + √b) = 12, then what is a in terms of b?  [#permalink]

### Show Tags

21 Jan 2019, 23:47
00:00

Difficulty:

15% (low)

Question Stats:

85% (00:46) correct 15% (01:30) wrong based on 26 sessions

### HideShow timer Statistics

If (√a − √b)(√a + √b) = 12, then what is a in terms of b?

A b + 12
B b^2 + 12
C √b + 12
D √b + √12
E √b – √12

_________________
VP
Joined: 31 Oct 2013
Posts: 1491
Concentration: Accounting, Finance
GPA: 3.68
WE: Analyst (Accounting)
Re: If (√a − √b)(√a + √b) = 12, then what is a in terms of b?  [#permalink]

### Show Tags

21 Jan 2019, 23:55
Bunuel wrote:
If (√a − √b)(√a + √b) = 12, then what is a in terms of b?

A b + 12
B b^2 + 12
C √b + 12
D √b + √12
E √b – √12

Given

(√a − √b)(√a + √b) = 12

$$(√a)^2 - (√b)^2 =12$$

a - b =12

a = 1 +12.

Re: If (√a − √b)(√a + √b) = 12, then what is a in terms of b?   [#permalink] 21 Jan 2019, 23:55
Display posts from previous: Sort by