- #1
klm
- 165
- 0
vector A = 7i + 4J
vector B= -4i - 8j
vector F = vector A - 3B
are you allowed to do this:
Fx= Ax - 3Bx : 7-3(-4) =19
Fy= Ay -3By : 4- 3(-8) = 28
or is there some rule to get the 3b?
and then how do you get the direction? when i do tan^-1 (28/19) = 55.8 . but how can i tell what quadrant vector F is in? i know vector A is in quad 1. and B is in quad 3. but since i am subtracting vector B, it is really going in quad 1? so is vector F really in quad 1?
sorry for all the questions!
vector B= -4i - 8j
vector F = vector A - 3B
are you allowed to do this:
Fx= Ax - 3Bx : 7-3(-4) =19
Fy= Ay -3By : 4- 3(-8) = 28
or is there some rule to get the 3b?
and then how do you get the direction? when i do tan^-1 (28/19) = 55.8 . but how can i tell what quadrant vector F is in? i know vector A is in quad 1. and B is in quad 3. but since i am subtracting vector B, it is really going in quad 1? so is vector F really in quad 1?
sorry for all the questions!