BREAKING: Target Test Prep releases Brand New 2026 On Demand GMAT prep course

Redeem

Quadratic Equation

This topic has expert replies
Post new topic Post Reply
Previous Topic Next Topic
User avatar
Legendary Member
Posts: 1132
Joined: Mon Jul 20, 2009 3:38 am
Location: India
Thanked: 64 times
Followed by:6 members
GMAT Score:760

Quadratic Equation

by harsh.champ » Fri Feb 19, 2010 9:48 am
(3x + 2) (2x - 5) = ax² + kx + n .
What is the value of a - n + k ?

A. 5
B. 8
C. 9
D. 10
E. 11
It takes time and effort to explain, so if my comment helped you please press Thanks button :)



Just because something is hard doesn't mean you shouldn't try,it means you should just try harder.

"Keep Walking" - Johnny Walker :P
Top
Source: — Problem Solving |
User avatar
Legendary Member
Posts: 748
Joined: Sun Jan 31, 2010 7:54 am
Thanked: 46 times
Followed by:3 members

by outreach » Fri Feb 19, 2010 10:00 am
(3x + 2) (2x - 5)=6x^2-11x-10

a=6
k=-11
n=-10

a - n + k=5

A
Top
User avatar
Legendary Member
Posts: 1275
Joined: Thu Sep 21, 2006 11:13 pm
Location: Arabian Sea
Thanked: 125 times
Followed by:2 members

by ajith » Fri Feb 19, 2010 12:21 pm
harsh.champ wrote:(3x + 2) (2x - 5) = ax² + kx + n .
What is the value of a - n + k ?

A. 5
B. 8
C. 9
D. 10
E. 11
(3x + 2) (2x - 5) = 6x^2 - 6x- 10
a=6 n = -10 k = -6
a-n =16
a -n +k = 10

D
Always borrow money from a pessimist, he doesn't expect to be paid back.
Top
User avatar
Legendary Member
Posts: 1132
Joined: Mon Jul 20, 2009 3:38 am
Location: India
Thanked: 64 times
Followed by:6 members
GMAT Score:760

by harsh.champ » Fri Feb 19, 2010 12:44 pm
ajith wrote:
harsh.champ wrote:(3x + 2) (2x - 5) = ax² + kx + n .
What is the value of a - n + k ?

A. 5
B. 8
C. 9
D. 10
E. 11
(3x + 2) (2x - 5) = 6x^2 - 6x- 10
a=6 n = -10 k = -6
a-n =16
a -n +k = 10

D
Hey ajith,
You did a mistake over here.
(3x+2)(2x-5) = 6x^2-11x-10
but you have written
(3x+2)(2x-5) = 6x^2-6x-10
Thus,you got the wrong answer.Answer would be A not D.
It takes time and effort to explain, so if my comment helped you please press Thanks button :)



Just because something is hard doesn't mean you shouldn't try,it means you should just try harder.

"Keep Walking" - Johnny Walker :P
Top
User avatar
Legendary Member
Posts: 1022
Joined: Mon Jul 20, 2009 11:49 pm
Location: Gandhinagar
Thanked: 41 times
Followed by:2 members

by shashank.ism » Sat Feb 20, 2010 7:34 am
harsh.champ wrote:(3x + 2) (2x - 5) = ax² + kx + n .
What is the value of a - n + k ?

A. 5
B. 8
C. 9
D. 10
E. 11
given equation is (3x + 2) (2x - 5) = ax² + kx + n
--> ax² + kx + n = (3x + 2) (2x - 5)
--> ax² + kx + n = 6x^2 -11x -10
so a=6 , k=-11, n= -10
so a-n+k = 6-(-10)+(-11)=5 Ans A
My Websites:
www.mba.webmaggu.com - India's social Network for MBA Aspirants

www.deal.webmaggu.com -India's online discount, coupon, free stuff informer.

www.dictionary.webmaggu.com - A compact free online dictionary with images.

Nothing is Impossible, even Impossible says I'm possible.
Top
Post new topic Post Reply
• Page 1 of 1