Question

If A 2i-2j+4k and B= -2i+j+k, then A.B is equal to

Answer 1

Answer:

-2

Explanation:

In dot product i*i=1 i*j=0 [same for each of i,j,k like j*j=1, j*k=0. etc]

Using that rule,

A.B=(2*(-2)) + ((-2)*1) + (4*1)

=-2