# 3d vectors

#### lolita20

##### New member

We have two vectors u = [5,5,5] and v = [-1,3,-1] ,
1- Compute the cross product u×v. Write the answer as [a,b,c].
2- Compute the cross product v×u. Write the answer as [a,b,c].
3- Compute the area of the parallellogram spanned by u and v

#### Dr.Peterson

##### Elite Member

We have two vectors u = [5,5,5] and v = [-1,3,-1] ,
1- Compute the cross product u×v. Write the answer as [a,b,c].
2- Compute the cross product v×u. Write the answer as [a,b,c].
3- Compute the area of the parallellogram spanned by u and v
Please follow our guidelines, so we can see where you need help:

Presumably you have been taught what a cross product is, so you can at least make an attempt.

#### lolita20

##### New member
I ve learnt and I solved this question but im not completey sure it is correct , here is the answer

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#### Dr.Peterson

##### Elite Member
I ve learnt and I solved this question but im not completey sure it is correct , here is the answer
Your v is different than what you said before. Which is correct?

Where are you unsure of your work?

#### pka

##### Elite Member
We have two vectors u = [5,5,5] and v = [-1,3,-1] ,
1- Compute the cross product u×v. Write the answer as [a,b,c].
2- Compute the cross product v×u. Write the answer as [a,b,c].
3- Compute the area of the parallellogram spanned by u and v
Here is a web resource. you can use it to check your work.