Question

How do you find the dot product of:

Answer 1

a*b
a=6i+5j
b=-5i+4j

Answer 2

u have to simplify

Answer 3

I did i tried the one where you expand it and I got 24+25 and that's49 it wasn't one of my choices

Answer 4

Then i did 6*-5,5*4 but I know that's wrong bc ive done it before like that and i got it wrong

Answer 5

ooo ok thati dont kow i just kow you culd simplyfi sorry

Answer 6

how would you do it though?

Answer 7

i dont kow im going to tell some body else to help u in a second ok

Answer 8

okay thanks :)

Answer 9

6*-5+5*4=-30+20=-10

Answer 10

hmm no you are right .... its -10

Answer 11

<(x1,x2),(y1,y2)> = x1*y1+x2*y2

Answer 12

http://en.wikipedia.org/wiki/Dot_product#Algebraic_definition

Answer 13

I was close i just had to minus it thank you :)