Algebra

New kid on the Block

Joined: 15 Sep 2011
Post: 21
6 Apr 2012 12:59:20 IST
0 People liked this
4
361 View Post
maths
Engineering Entrance , JEE Main , JEE Main & Advanced , Mathematics , Algebra

Suppose abc<0, a+b+c>0 and |a|/a +|b|/b +|c|/c = x , then the value of x^3 + 16x -7.



Comments (4)


Cool goIITian

Joined: 31 Mar 2012
Posts: 81
6 Apr 2012 12:59:58 IST
0 people liked this

abc0 means??

Cool goIITian

Joined: 31 Mar 2012
Posts: 81
6 Apr 2012 13:01:27 IST
0 people liked this

10 i think

New kid on the Block

Joined: 15 Sep 2011
Posts: 21
6 Apr 2012 13:04:12 IST
0 people liked this

how ??

Scorching goIITian

Joined: 10 Feb 2012
Posts: 262
6 Apr 2012 13:09:53 IST
0 people liked this

 

The definition for modulus function is

 

                               x if x>0 

mod(x)=

                   -x if x<0

 

Hence if a*b*c<0 and a+b+c>0

This implies one of the variables  can be negative an the other two positive

Now just assume a is negative and b and c are +ve

Then

mod(a)/a=-1

mod(b)/b=1

mod(c)/c=1

Now

x=1-1+1

x=1

done..

Now just calculate the value of the function

1+16-7=10

Please click like if you do understand

 




Quick Reply


Reply

Some HTML allowed.
Keep your comments above the belt or risk having them deleted.
Signup for a avatar to have your pictures show up by your comment
If Members see a thread that violates the Posting Rules, bring it to the attention of the Moderator Team
Free Sign Up!
Sponsored Ads

Preparing for JEE?

Kickstart your preparation with new improved study material - Books & Online Test Series for JEE 2014/ 2015


@ INR 5,443/-

For Quick Info

Name

Mobile

E-mail

City

Class

Vertical Limit

Top Contributors
All Time This Month Last Week
1. Bipin Dubey
Altitude - 16545 m
Post - 7958
2. Himanshu
Altitude - 10925 m
Post - 3836
3. Hari Shankar
Altitude - 10085 m
Post - 2217
4. edison
Altitude - 10825 m
Post - 7804
5. Sagar Saxena
Altitude - 8635 m
Post - 8064
6. Yagyadutt Mishr..
Altitude - 6330 m
Post - 1958

Find Posts by Topics

Physics

Topics

Mathematics

Chemistry

Biology

Parents Corner

Board

Fun Zone