Home
Class 12
MATHS
If |veca xx vecb|^(2) + |veca.vecb|^(2)=...

If `|veca xx vecb|^(2) + |veca.vecb|^(2)=144` and `|veca|=4`, then `|vecb|` is equal to --

A

12

B

3

C

8

D

4

Text Solution

Verified by Experts

The correct Answer is:
B
Promotional Banner

Similar Questions

Explore conceptually related problems

If |vecaxxvecb|^(2)+(veca.vecb)^(2)=144and|veca|=4,"then "|vecb| is equal to ……..

If |veca xx vecb|^(2) + |veca.vecb|^(2)=144 and |veca|=4 , then find the value of |vecb|

If | veca| = 2 |vecb|=5 and | veca xx vecb| = 8 , then | veca. vecb| is equal to :

[(veca,vecb,axxvecb)]+(veca.vecb)^(2)=

If |vecaxxvecb|=2,|veca.vecb|=2 , then |veca|^(2)|vecb|^(2) is equal to

Let veca and vecb are vectors such that |veca|=2, |vecb|=3 and veca. vecb=4 . If vecc=(3veca xx vecb)-4vecb , then |vecc| is equal to

Vectors veca and vec b are inclined at an angle theta = 120^@ . If |veca| = |vecb| = 2 , then [(veca + 3vecb) xx (3veca + vecb)]^2 is equal to

If |veca| = 10, |vecb|=2 and veca.vecb=12 , then the value of |veca xx vecb| is:

If veca and vecb are any two vectors , then prove that |vecaxxvecb|^(2)=|veca|^(2)|vecb|^(2)-(veca.vecb)^(2)=|{:(veca.veca,veca.vecb),(veca.vecb,vecb.vecb):}| or |vecaxxvecb|^(2)+(veca.vecb)^(2)=|veca|^(2)|vecb|^(2) (This is also known as Lagrange identily)