Question

Find a • b.

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

<2, 11>

32

<-8, 24>

16

Answer 1

Hint:

If

v = a*i + b*j and w = c*i + d*j

then

v dot w = a*c + b*d

Answer 2

ok onesec let me calculate

Answer 3

so its 16

Answer 4

16 is correct