VectorHard
Question
The value of the constant p such that the vectors 
and 
are coplanar is:-
and are coplanar is:-Options
A.zero
B.2
C.-4
D.-2
Solution
If three vectors 
, are coplanar, then 
must be zero.
Here,
Now,
= 3 + 7p + 25 = 0
⇒ 28 + 7 p = 0 or p = - 4
, are coplanar, then must be zero.Here,
Now,
= 3 + 7p + 25 = 0
⇒ 28 + 7 p = 0 or p = - 4
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