Question

Find a • b.

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

Answer 1

you have to calculate the dot product

http://www.mathsisfun.com/algebra/vectors-dot-product.html

Answer 2

so you're just multiplying corresponding components, then adding

Answer 3

so the answer would be (16,12) ? @jim_thompson5910

Answer 4

you add those products to get the final answer

Answer 5

and 4*(-4) = -16, not positive 16

Answer 6

so it would be -4 ? @jim_thompson5910

Answer 7

correct

Answer 8

thanks for your help @jim_thompson5910

Answer 9

you're welcome