Question

Find a ⋅ b.

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

Answer 1

if

x = ai+bj
y = ci + dj

then

x dot y = a*c + b*d

Answer 2

Basically, to find the dot product of two vectors, you

step 1) multiply the corresponding components

step 2) add up the products found in step 1

Answer 3

So it would come out to be -36?

Answer 4

That is incorrect.

Answer 5

ah -4. Did my math wrong.

Answer 6

much better