These are the questions I didn't get from my vectors homework tonight.

Note that vectors are represented by bolded letters.

1. What conditions must be satisfied by the vectorsuandvfor |u+v|>|u-v| to be true?

2. Illustrate for k>0 that k(u+v) = ku+ kv.

3. By considering the angles between the vectors show thata+banda-bare perpendicular when |a| = |b|.

Thanks!