Question

Given vectors u and v such that uv=−2I+9J+2K find:
v x u?
(u x v) • (u x v)?

Answer 1

Ive already got v x u = 2i+-9j+-2k

Answer 2

(u x v) • (u x v)? i thought it was -4+-81+-4 but that is wrong

Answer 3

Dot products don't return vectors.

Answer 4

-4-81-4=89

Answer 5

I don't know what you're computing, but I want some of it too.

Answer 6

It said that was wrong

Answer 7

Yeah, youre not going to get uv to be a vector, only a number. So maybe the problem is stated wrong?

Answer 8

got it as 89. was it supposed to be absolute value?

Answer 9

@wio does that screenshot help?