Question

Help! Find the following vectors, given:
a=(3,-4) and b=(1,2)
-3b= ?

Answer 1

Scalar multiplication with vectors is as follows: For scalar value (like a number) a and vector v = <v1,v2,v3...>,
\[a \vec v=<a v_1, av_2, av_3,...>\]

Answer 2

hmmm I'm still confused... So what's -3b ?

Answer 3

Well, in this case, -3 is the "a" and b is the "v".

Answer 4

But these are the possible choices:
(-3,-6)
(0, -7)
(-2, -1)
(-9, 16)

Answer 5

b=(1,2)
-3b=((-3)*1,(-3)*2)

Answer 6

Thanks :)