Asked by batmo

1.Find vectors v*w if vector v = 5 vector i – 4 vector j + 4 vector k and vector w = –6 vector i + 3 vector j – 2 vector k.

2.Find vectors v*w if vector v = -3 vector i – 4 vector j - 8 vector k and vector w = 2 vector i + 6 vector j + 4 vector k.

Answers

Answered by Steve
v*w has no meaning in common notation.
Do you mean v•w or v×w ?
Answered by batmo
v times w
Answered by Steve
i assume you mean cross-product

I'll do #1:

vxw =
| i j k|
|5 -4 4 |
|-6 3 -2|
= 32i-28j+26k

You can make things a lot more readable by just saying you're dealing with vectors. Then you can forget about all those words and just write the values, as in my answer.
Answered by batmo
no i don't mean cross product.

3– 4– 2
–14– 9– 4
5+ 3– 4
–4– 14– 9

these are the possible answers. all with IJK following of course.
Answered by Steve
In that case, say dot product.
5i-4j+4k • -5i+3j-2k = -25-12-8 = -45

you say you don't mean cross product, but you give vectors for answers.

dot product of two vectors is just a number.

I'm afraid I don't know what operation you are using.
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