Question

Find a • b.

a = 4i + 8j, b = -2i + 3j

Answer 1

thought that was a minus sign

Answer 2

looks like you want to do a dot product?

Answer 3

<2, 11>
32
<-8, 24>
16
These are my choices

Answer 4

Im taking a quiz and I cant figure this one out.

Answer 5

\[A * B = AxBx + AyBy \]

Answer 6

then you need to refresh yourself on the dot product operation.

Answer 7

The dot product results in a scalar quantity, not a vector

Answer 8

wouldnt it be C

Answer 9

the vectors are written in a different notation is all:

if u = (a,b) then we can rewrite it as: u = ai + bj

thats all

Answer 10

No C is a vector, the dot product results in a number only

Answer 11

Ax*Bx + Ay*By

Answer 12

so 32

Answer 13

4(-2) + 8(3) =...

Answer 14

forgot about the negative thank you @DanJS

Answer 15

no prob, remember for vector multiplication,
Dot Product = Scalar
Cross Product = vector orthogonal to both A and B and has a magnitude of the area spanned by A and B

Answer 16

thanks again