Question

Find a ⋅ b. a = 9i + 5j, b = 4i + 3j

Answer 1

`\mathbf a\cdot\mathbf b=9*4+5*3=36+15=51`

Answer 2

ANSWER


`a.b = 51`


Step-by-step explanation


The given vectors are:



`a = 9i + 5j`
and


`b = 4i + 3j`


To find the dot product of the two vectors, we multiply the corresponding components and add them.



`a.b = 9 * 4 + 5 * 3`


This implies that,


`a.b = 36+ 15`



`a.b = 51`


Therefore the dot product of the two vectors is 51.