Given that a = 5i +2j - k and b = I - 3j + k. Find (a + b) x (a + b).

Answer 1

a+b = 6 i -1 j + 0 k
trick question or typo
cross product = |A||A| sin theta
theta = 0
so cross product = 0

Answer 2

correct. You didn't even have to find a+b.

Answer 3

Given that a = 5i +2j - k and b = I - 3j + k. Find (a + b) x (a + b).