# Math Help - Dot product

1. ## Dot product

just want to make sure im doing this right

Given the vectors A = 10ˆi +4ˆj, B = 3ˆi −2ˆj +5ˆk
(a) A · B

(10)(3)+(-2)(4)+(5)(0)=22
or is it
(10)/(3)+(-2)(4)+5=27

just didn't know if i would multiply by zero or not

2. It is $(10)(3)+(-2)(4)+(5)(0)=22$

3. ok thanks just wanted to make sure would hate to make mistake like that