Question

A=2i+j-k
B=i-j+xi
यदि A, B लम्बवत है तो x का मान होगा।
Find value of x if A and B are perpendicular.​

Answer 1

Error: in your question...B=i-j+xi ...is it i or k

Answer:

if it is k... the ans.. may be -1/2

Explanation:

A.B = /A/./B/ Cos theta

(2i+ j- k) ( i - j + xk) = root of {2^2 +1^2+(-1)^2} × root of {1^2+(-1)^2 + x^2 } cos 0°

or,(1-x)^2 = { root of (2+x^2) }^2

or,1+x^2 -2x = 2+ x^2

or,x = - 1/2