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

hello from mrbilldoesmath!

answer:

a(n) - a(n-1) -3

discussion:

this ones a bit interesting. given a(n) = 5 - 3n consider this:

a(n-1) = 5 - 3(n-1)

          = (5 - 3n) + 3             => but a(n) = 5 - 3n, the first term

          = a(n)   + 3                 => subtract 3 from both sides

a(n-1) -3 = a(n)  

or

a(n) - a(n-1) -3

you,

mrb

constants mean the stopped points or the points on a graph that nothing is changing, hope this

step-by-step explanation: