Question

if a = 2i-3j+7k b = i-2j and c = j-k then a.(b×c)​

Answer 1

Answer:

Explanation: a.(b×c)

( b×c) means cross product = [I j k]

1 -2 0

0 1 -1

Therefore (b×c)= i(2-0)-j(-1-0)+k(1)

= 2i+j+k

a.( b×c) means dot product = 2×2-3+7

= 4-3+7

=8