Question

(I will give Brainliest/5 stars to correct answer)
Find a ⋅ b.

a = 7i - 4j, b = 4i + 3j

A) <28, -12>
B) 16
C) -40
D) <11, -1>

Answer 1

a•b = 7*4 +(-4)*3
= 28 -12
= 16 . . . . . matches selection B

Answer 2

To find the dot product you multiply the corresponding coordinates and then add up the products

a dot b = dot product between the vectors 'a' and 'b'
a dot b = 7*4 + (-4)*3
a dot b = 28 - 12
a dot b = 16

Answer: Choice B) 16