Recent content by Wsaw

There are no other conditions to the vector. Anyway, thanks for your help!

My book says that all the vectors of the form (a,b,0) are not subspaces of R3 which I do not understand why.

Thanks but if u = (a,b,0) v = (c,d,0) then u+v = (a+c, b+d, 0) = w kw = [ka+kc,kb+kd,k0) With that answer, I would say that all the vectors of the form (x,y,0) are subspaces of R3 but my answers book say this is not and that (x,0,0) is.

Homework Statement 1) Determine if a) (a,b,c), where b=a+c b) (a,b,0) are subspaces of R3 and 2) Determine whether the given vectors span R3 a) v1 = (3,1,4) v2 = (2,-3,5) v3 = (5,-2,9) v4 = (1,4,-1) Homework Equations - If u and v are vectors in W, then u + v is in W -...