---You probably know that subtraction is the same thing
as adding a negative: 8 – 5 is the same thing as 8 + (–5). The easiest
way to think about vector subtraction is in terms of adding a negative
vector. What’s a negative vector? It’s the same vector as its positive
counterpart, only pointing in the opposite direction.
A – B,
then, is the same thing as A +
(–B). For instance,
let’s take the two vectors A and B:
To subtract B from A,
take a vector of the same magnitude as B,
but pointing in the opposite direction, and add that vector to A,
using either the tip-to-tail method or the parallelogram method.