- #1
noeinstein
- 14
- 0
Homework Statement
Given that A = 2i + 4j, evaluate each of the following. (Hint: This question can be answered without computation.)
(a) What is AxB when B = 8i + 16j?
(b) What is AxB when B = -8i - 16j?
Homework Equations
AxB=(Axi + Ayj) x (Bxi +Byj)
=(AxBx)(i x i) + (AxBy)(i x j) + (AyBx)(j x i) + (AyBy)(j x j)
AxB=(AxBy - AyBx)k
The Attempt at a Solution
AxB= (2 x 16)k - (4 x 8)k= 0k