Question

1038C04042 Question: Hindi If a = 2i – 3j + 2k and b= 6i - 9j + 6k, then​

Answer 1

Given a= 2i-3j+2k

b=6i-9j+6k

so scalar product

a. b= (2i-3j+2k)(6i-9j+6k)

a. b= 12(i.i)+27(j.j)+12(k.k)

a. b=12+27+12 [Here i.i=1;j.j=1; k.k=1]

=51