Question

Find a ⋅ b.

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

Answer 1

The answer is 30

Explanation:

To get a.b

For a = <wa, za> and b = <wb, zb>, the dot product represents multiplication sign.

We say,

a•b = (wa)(wb) + (za)(zb)

The next step is to substitute the given information into the above equation we generated.

Then we say,

a•b = 5•4 + 2•5

a.b = 20 + 10

a•b = 30

The answer is 30