Finding Vectors to Span Set W: Can u and v Fully Represent W?

cdub2
Messages
5
Reaction score
0
I am having some trouble with this problem...

Let W be the set of all vectors of the form:

(-5b-4c
b
c)

^ (that is supposed to be in vector form)

Find vectors u and v such that W = Span {u,v}.
 
Physics news on Phys.org
Hint:
x=-5b-4c
y=1b+0c
z=0b+1c
 
thanks !
 
There are two things I don't understand about this problem. First, when finding the nth root of a number, there should in theory be n solutions. However, the formula produces n+1 roots. Here is how. The first root is simply ##\left(r\right)^{\left(\frac{1}{n}\right)}##. Then you multiply this first root by n additional expressions given by the formula, as you go through k=0,1,...n-1. So you end up with n+1 roots, which cannot be correct. Let me illustrate what I mean. For this...
Back
Top