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

 It is currently 21 May 2019, 12:51

### 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 j * k = j^2-2jk + k^2 for all integers j and k, then 4 * 3 =

Author Message
TAGS:

### Hide Tags

Manager
Joined: 13 Jun 2012
Posts: 203
Location: United States
WE: Supply Chain Management (Computer Hardware)
If j * k = j^2-2jk + k^2 for all integers j and k, then 4 * 3 =  [#permalink]

### Show Tags

26 Jul 2017, 17:03
1
00:00

Difficulty:

5% (low)

Question Stats:

95% (00:37) correct 5% (00:00) wrong based on 35 sessions

### HideShow timer Statistics

If $$j * k = j^2-2jk + k^2$$ for all integers j and k, then 4 * 3 =

(A) 49
(B) 13
(C) 1
(D) -1
(E) -14
Senior SC Moderator
Joined: 22 May 2016
Posts: 2745
Re: If j * k = j^2-2jk + k^2 for all integers j and k, then 4 * 3 =  [#permalink]

### Show Tags

26 Jul 2017, 17:16
Turkish wrote:
If j * k = j^2-2jk + k^2 for all integers j and k, then 4 * 3 =
(A) 49
(B) 13
(C) 1
(D) -1
(E) -14

1. $$j^2 - 2jk + k^2$$ = $$(j - k)^2$$

$$(4 - 3)^2$$ = 1 * 1 = 1

2. If you miss that the expression is the square of a difference, plug in:

$$4^2 - (2)(4)(3) + 3^2$$ =
16 - 24 + 9 = 1

_________________
Listen, are you breathing just a little, and calling it a life?
-- Mary Oliver

For practice SC questions go to SC Butler, here.

Re: If j * k = j^2-2jk + k^2 for all integers j and k, then 4 * 3 =   [#permalink] 26 Jul 2017, 17:16
Display posts from previous: Sort by