- #1

Painguy

- 120

- 0

**For what values of "a" are teh vectors parallel**

## Homework Statement

**v**= 5a i -3 j

**w**= a^2 i -6 j

## Homework Equations

## 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.