Question

4. a. Calculate the scalar projection of (5,3) onto (7,-2).

Answer 1

\[=(5*7-3*2)/\sqrt{53}\]

Answer 2

can you explain that? i dont understand. @myko

Answer 3

To calculate the projection of a onto b,
1) Do the dot product.
2) Divide by the length of b.

Answer 4

Do you know how to do the dot product?

Answer 5

no

Answer 6

<a,b><c,d>=ac+bd
this is scalar product of two vectors

Answer 7

It's pretty simple =)
If I have \[\left(\begin{matrix}a \\ b\end{matrix}\right) . \left(\begin{matrix}c \\ d\end{matrix}\right)\]
I do a*c + b*d

Answer 8

im more concerned that your asking this question without knowing how to do the fundamentals of it :/

Answer 9

I'm not concerned. She's asking for an explanation and sticking around to hear it.

Answer 10

good one

Answer 11

Does that make sense, sea-child?

Answer 12

Could you try to do this dot product for me?
\[\left(\begin{matrix}2 \\ -3\end{matrix}\right).\left(\begin{matrix}4 \\ -6\end{matrix}\right)\]

Answer 13

i got 26.

Answer 14

i dont know if thats right

Answer 15

Yes, perfect =)