For what values of "a" are teh vectors parallel 1. The problem statement, all variables and given/known data v = 5a i -3 j w = a^2 i -6 j 2. Relevant equations 3. The attempt at a solution My first thought was too get the unit vectors of both and set them equal to each other and solve for a, but that got messy. (5a i- 3j)/sqrt(25a^2 +9) = (a^2i -6j)/sqrt(a^4 +36) I tried solving for a separately and got a=5, but its obvious that is wrong because i end up with 25 i -3 j =25 i -6 j I'm not supposed to use the dot product for this problem.