Home » Ask & Discuss » Mathematics. » Algebra « Back to Discussion

Algebra

Scorching goIITian

Joined:	1 Feb 2007
Post:	297

5 Mar 2007 22:05:07 IST

0 People liked this

675

a prob on bionomial theorem...........pls solve it quickly

None

find the cubic equation whose roots are 1 , -2 , 3

Share this article on:

Comments (7)

vineet bhat

Cool goIITian

Joined: 3 Mar 2007

Posts: 38

5 Mar 2007 22:38:10 IST

Like 3 people liked this

since roots are1,-2,3
=(x-1)(x+2)(x-3)
=(x^2+x-2)(x-3)
=(x^3+x^2-2x-3x^2-3x+6)
=(x^3-2x^2-5x+6)
here is the answer
plz........... rate me.

edison

Forum Expert

Joined: 19 Oct 2006

Posts: 7537

5 Mar 2007 22:44:42 IST

Like 0 people liked this

That is well done vineet

sneha kulkarni

Scorching goIITian

Joined: 1 Feb 2007

Posts: 297

5 Mar 2007 22:46:23 IST

Like 0 people liked this

then what about these roots........-1 , 1+i , 1-i

vineet bhat

Cool goIITian

Joined: 3 Mar 2007

Posts: 38

5 Mar 2007 23:26:50 IST

Like 0 people liked this

they are
=(x+1)[(x-1)-i][(x-1)+i]
=(x+1)[(x-1)^2-i^]
=(x+1)[(x-1)^+1]
=(x+1)[x^2-2x+2]
=x^3-2x^2+2x+x^2-2x+2
=x^3-x^2+2
that is the answer
if it is right plz.rate me

irfan ahmad

New kid on the Block

Joined: 23 Jan 2007

Posts: 6

6 Mar 2007 09:57:33 IST

Like 1 people liked this

they are
=(x+1)[(x-1)-i][(x-1)+i]
=(x+1)[(x-1)^2-i^]
=(x+1)[(x-1)^+1]
=(x+1)[x^2-2x+2]
=x^3-2x^2+2x+x^2-2x+2
=x^3-x^2+2
that is the answer
if it is right plz.rate me

vineet bhat

Cool goIITian

Joined: 3 Mar 2007

Posts: 38

7 Mar 2007 10:43:01 IST

Like 0 people liked this

they are
=(x+1)[(x-1)-i][(x-1)+i]
=(x+1)[(x-1)^2-i^]
=(x+1)[(x-1)^+1]
=(x+1)[x^2-2x+2]
=x^3-2x^2+2x+x^2-2x+2
=x^3-x^2+2
that is the answer
if it is right plz.rate me

vishak p

Blazing goIITian

Joined: 9 Feb 2007

Posts: 1347

14 Mar 2007 18:10:21 IST

Like 0 people liked this

whatever roots say a,b,c are given to u, form the equation (x-a)(x-b)(x-c) = 0

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