Question

A=3i-j+k B=3i-2j+k answer A. B?

Answer 1

Answer:

12

Step-by-step explanation:

= (3i-j+k).(3i-2j+k)

we know i.i=1 ; j.j=1 ; k.k=1

= (3*3)(i.i) +(-1*-2)(j.j) + (1*1)(k.k)

= 9+ 2 +1

=12