Question

Find the inner product for (7,2) × (0,-2) and state wheter the vectors are perpendicular ​

Answer 1

Explanation:

let a=7i+2j

and b=-2j

a.b=(7i+2j).(0i-2j)

=0i-4j

≠0

they are not perpendicular.

Answer 2

a. -4

Explanation:

a•b = (x1 × x2) + (y1 × y2)

= (7 × 0) + (2 × -2)

= 0 - 4

= -4