Find all School-related info fast with the new School-Specific MBA Forum

 It is currently 27 Mar 2015, 20:17

### 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

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# Determine 'k' if one of the roots of the equation k(x-1)^2 =

Author Message
TAGS:
Senior Manager
Joined: 30 Aug 2003
Posts: 330
Location: BACARDIVILLE
Followers: 1

Kudos [?]: 1 [0], given: 0

Determine 'k' if one of the roots of the equation k(x-1)^2 = [#permalink]  30 Jan 2004, 13:10
Determine 'k' if one of the roots of the equation k(x-1)^2 = 5x-7 is double the other.

a)-2
b)2
c)25
d)both a and b
e)
_________________

Pls include reasoning along with all answer posts.
****GMAT Loco****
Este examen me conduce jodiendo loco

Senior Manager
Joined: 30 Aug 2003
Posts: 325
Location: dallas , tx
Followers: 1

Kudos [?]: 8 [0], given: 0

thta's wat i call indian beauty.. but i didnt try to solve the prb yet.
_________________

shubhangi

Manager
Joined: 25 Jan 2004
Posts: 92
Location: China
Followers: 1

Kudos [?]: 2 [0], given: 0

f = (x-a)(x-2a) = x^2 -3a x + 2a^2 x = 0

3a = (2k+5)/k
2a^2 = (k+7)/k

2(2k+5)^2/(9k^2) = (k+7)/k

8k^2 + 40k + 50 = 9k^2 + 63k
k^2 + 23k - 50 = 0
(k+25)(k-2) = 0

The other way is plug and play.
Intern
Joined: 13 Aug 2003
Posts: 26
Location: DELHI
Followers: 0

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

Similar topics Replies Last post
Similar
Topics:
If there is exactly one root of the equation x^2 + ax + b 8 23 Aug 2011, 22:17
One root; Find the value of k 3 17 Apr 2011, 08:17
2 5 roots in one equation 4 14 Jan 2010, 04:31
roots of equation 3 11 Nov 2009, 08:22
1)^k+1(1/2^k) If this equation determines the terms in a 7 15 Oct 2006, 15:29
Display posts from previous: Sort by