Answer:

Explanation:
Given
a = (2,-8)
b = (-1,4)
Required
Product of a and b
Product of a and b can be represented as ab and this can be solved using dot product of a and b
The dot product is the sum of the products of the corresponding entries where the entries are (2,-8) and (-1,4)
Provided that a and b are vectors,

Where

By Substitution
becomes



