Question

What is the cross product of `(- 5 i + 4 j - 5 k)` and `(- 4 i - 5 j + 2 k)`?

Answer 1

`vec a x vec b=-17i+30j+41k`

Explanation:

`vec a x vec b=i(8-25)-j(-10-20)+k(25+16)`
`vec a x vec b=-17i+30j+41k`