Question

Find a*b. a=<5,2> , b=<4,5>

Answer 1

Find the dot product of the vectors

a = <ax, ay> and b = <bx, by>

The dot product is found by multiplying corresponding coordinates, and then sum all those products:

a * b = ax * ay + bx * by

________

For this question, you have these vectors

a = <5, 2> and b = <4, 5>

so the dot product is

a * b = 5 * 4 + 2 * 5

a * b = 20 + 10

a * b = 30 <----- this is the answer.


I hope this helps. =)