Question

If u = <-5, -3> and v = <-4, 6>, find u · v.

38

2

-2

-38

Answer 1

u.v=(u1v1 + u2v2)

Answer 2

by definition of scalar product, we have:
\[u \cdot v = \left( { - 5} \right) \times \left( { - 4} \right) + \left( { - 3} \right) \times 6 = ...?\]

Answer 3

20x

Answer 4

+

Answer 5

\[u \cdot v = \left( { - 5} \right) \times \left( { - 4} \right) + \left( { - 3} \right) \times 6 = 20 - 18 = ...?\]

Answer 6

2

Answer 7

that's right!