posted by batmo on .
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.
v*w has no meaning in common notation.
Do you mean v•w or v×w ?
v times w
i assume you mean cross-product
I'll do #1:
| i j k|
|5 -4 4 |
|-6 3 -2|
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.
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.
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.