ok, I guess I don't know how to find 2a-3b, I thought I had to find the length of a first and then find the length of b. After that I would multiply a with 2 and b with 3. So 2a-3b would be = 58 - 174. But I guess that is the wrong way of doing it.
Hi there (=. Before we start let us understand how scalar multiplication and subtraction of vectors works.
Scalar multiplication:
Subtraction of two vectors
can be geometrically defined as follows: to subtract b from a, place the end points of a and b at the same point, and then draw an arrow from the tip of b to the tip of a. That arrow represents the vector a − b, as illustrated below:
The difference of a and b is
now find the resulting vector and find it's magnitude which you seem to know how to do.
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