to need to learn this.
So the vector you want is
Find a vector of length 3 which has:
a) the same direction as 5i + 2j
b) the opposite direction to 4i + 5j
then
the is square root...but I don't know how to show that on here. is my math correct?
and is b) done the same way except I would multiply the whole thing by -1?
Thanks