Question

Use the dot product to find |v| when v=(-2, -1).

Answer 1

For this case we have the following vector:
 v = (- 2, -1).
 Using product point we have:
 v.v = (-2, -1). (- 2, -1)
 v ^ 2 = (-2) * (- 2) + (-1) * (- 1)
 v ^ 2 = 4 + 1
 v ^ 2 = 5
 Then, clearing the module we have:
 v = root (5)
 Answer:
 The module of the vector is given by:
 v = root (5)
 C. square root of 5

Answer 2

Answer:

C. square root of 5