Question

Find a ⋅ b.

a = 9i + 5j, b = 4i + 3j

Answer 1

51

<13, 8>

<36, 15>

-21

Answer 2

@sauravshakya @A.Avinash_Goutham @amistre64

Answer 3

yes

Answer 4

Its a dot product

Answer 5

Hint: if a=xi+yj AND b=x'i+y'j
THEN a . b = x*x' + y*y'

Answer 6

can you show me how to work out this problem.

Answer 7

First can u tell me the values of x , x' ,y , y'

Answer 8

Just compare what I gave in the Hint and your question