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Vectors

Blazing goIITian

Joined:	16 Dec 2006
Post:	1362

31 Mar 2008 13:30:19 IST

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219

3 D geometry

None

The planes x + ky + kz = 1, kx +y +2kz = -4, kx ? ky + 4z = 2
Intersect in a point. The values k cannot take is
(A) -1,2
(B) -2,-1
(C) 2,1
(D) -2,1

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varsha valli g.

Blazing goIITian

Joined: 31 Jan 2007

Posts: 515

1 Apr 2008 11:32:55 IST

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assuming the '?' in ur Q as '+'
take the determinant of the 3 lines which implies they are in the same plane.
u will get,3k^3 -7k^2 +4 !=0
for k=1 and k=2 the eqn bcomz =0,which shud not happen
so the values k cannot take are 1,2
correct me if m wrong
!!!!!!!!!!!!!!!!!!!!

varsha valli g.

Blazing goIITian

Joined: 31 Jan 2007

Posts: 515

1 Apr 2008 11:33:22 IST

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am i right???

!!!!!!!!!!!!!

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