Question

evaluate the dot product of (2 4) and (1 -2)

Answer 1

@jim_thompson5910

Answer 2

in general we have the two vectors v and w

v = (a,b)
w = (c,d)

the dot product of the two is

v dot w = a*c + b*d

Answer 3

use that formula to get your answer

Answer 4

so 2x1+-4x2? @jim_thompson5910

Answer 5

well 4 times -2, but you have the right idea

Answer 6

-6 @jim_thompson5910 sorry but I want to confirm sorry for bothering

Answer 7

2*1 + 4*(-2) = -6, yep, correct

Answer 8

yay thanks mucho @jim_thompson5910