Question

Find the dot product, a • b.

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

Answer 1

I opened a new question so i could give you another medal lol how do you do this?? @SolomonZelman

Answer 2

50
<1, 9>
-10
<-30, 20>
these are the answers

Answer 3

@jim_thompson5910

Answer 4

multiply and add

Answer 5

\[<x_1,x_2>\cdot <y_1,y_2>=x_1y_1+x_2y_2\]

Answer 6

ok so is it <-30,20> or -10?? and why? @satellite73

Answer 7

the dot product is defined as
<a,b> dot <c,d>
ac+bd

you multiply first components
you multiply second components
...
you multiply the nth components
then add those products to find the dot product

Answer 8

the dot product will be just a number
not a vector

Answer 9

okay thank you!! @freckles and @satellite73

Answer 10

np