Find a b if a =(2,- 8) and b =(-1,4).

а. -30

b. {1,- 4}

с. -34

d. -2.- 32

Please select the best answer from the choices provided

Step-by-step 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