# Homework Help: Vectors problem #3

1. Sep 9, 2008

### BeckyStar678

1. The problem statement, all variables and given/known data

two vectors A and B have precisely equal magnitudes. For the magnitude of A +B to be larger than the magnitude of A-B by the factor n, what must be the angle between them?

2. Relevant equations

3. The attempt at a solution

i dont understand this because a-b would equal 0. so wouldn't the angle just be 0 degrees?

Last edited: Sep 9, 2008
2. Sep 9, 2008

### alphysicist

Hi BeckyStar678,

The vectors $\vec A$ and $\vec B$ have the same magnitude, but $\vec A-\vec B$ does not equal zero unless they point in the same direction. You have to use the rules of vector addition to write out what $\vec A+\vec B$ and $\vec A-\vec B$ are.