Help on my test: “perform the computation 3u-5v if u = <3,-2> and v= <-5,3>.”

[Gummg]

Help on my test: “perform the computation 3u-5v if u = <3,-2> and v= <-5,3>.”

Help on my test:

How do I “perform the computation 3u-5v if u = <3,-2> and v= <-5,3>.” I don’t know what to do

 

[stapel]

Help on my test:

How do I “perform the computation 3u-5v if u = <3,-2> and v= <-5,3>.” I don’t know what to do

Multiply u by 3.

Multiply v by 5.

Subtract the latter from the former.

(If you're taking the test on vectors, then you've spent a great deal of time on them by now. I don't feel comfortably providing any more "help" on a test than the above. Sorry.)

 

[HallsofIvy]

Obviously, whoever gave you this test expects you to know:
1) scalar multiplication of a vector: a<p, q>= <ap, aq>.

2) addition of vectors:<p, q>+ <r, s>= <p+r, q+s>.

 

[Gummg]

Solution

I got <34, -21> But now it’s asking to find the direction angle of the resultant

 

[stapel]

I got <34, -21> But now it’s asking to find the direction angle of the resultant

Okay; what method(s) or formula(s) have they given you for this? How far have you gotten in applying this information? Where are you stuck?

Please be complete. Thank you!