Question

How do I do vector subtraction?

Answer 1

Given two vectors `vecv` and `vecw` you have:
`vecv-vecw=vecv+(-vecw)`

Graphically we can use the Parallelogram Law:

If you have the vectors in components form you again use:
`vecv-vecw=vecv+(-vecw)` operating on each set of corresponding components.

For example:
`vecv=4veci+2vecj-5veck` and:
`vecw=-2veci+4vecj+veck`

`vecv-vecw=vecv+(-vecw)=[4+(2)]veci+[2+(-4)]vecj+[-5+(-1)]veck=`
`=6veci-2vecj-6veck`