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. =)
