anonymous 4 years ago what is the length magnitude of the vector 2,-1?

1. myininaya

$|v|=|<a.b>|=\sqrt{a^2+b^2}$

2. anonymous

what is the the formula, and what a and b i dont understand what you just wrote

3. myininaya

a=2 and b=-1 where v is the vector <a,b>=<2,-1>

4. myininaya

just plug in 2 for a and -1 for b

5. myininaya

and you will be done :) after simplifying

6. anonymous

1.73?

7. myininaya

$\sqrt{(2)^2+(-1)^2}=\sqrt{4+1}=\sqrt{5}$

8. anonymous

sqrt 5

9. anonymous

a vector has both a magnitude and a ? is it a number?

10. myininaya

direction