Question

find the magnitude of the vector <-2,-4>
Please help :)

Answer 1

for any vector v = <a,b> the magnitude, call it m, is

m = |v| = sqrt(a^2 + b^2)

Answer 2

so.. sqrt(20) -thats all?

Answer 3

you can simplify that

Answer 4

hint: 20 = 4*5

Answer 5

another hint:

sqrt(x*y) = sqrt(x) * sqrt(y)

Answer 6

thanks!

Answer 7

what did you get

Answer 8

2sqrt5

Answer 9

perfect