Question

I think is is A but not sure...
The following function defines a recursive sequence.

f(0) = -2

f(1) = 8

f(n) = -4•f(n -1) - 3•f(n - 2); for n > 1

Which of the following sequences is defined by this recursive function?

-2, 8, -26, -80, …

-2, 8, -26, 80, …

-2, 12, -44, 180, …

-2, -12, -44, -180, …

Answer 1

can someone hhelp me with my question?

Answer 2

@AwakeReality @hartnn @skullpatrol please help me...

Answer 3

f(2) is -26
to get f(3), just plug in n = 3 in
f(n) = -4•f(n -1) - 3•f(n - 2)
what do u get ?

Answer 4

ok...

Answer 5

F(3) = -4 x 2 - 3 x 1
i get -11...

Answer 6

@hartnn???

Answer 7

f(n-1)= f(3-1) = f(2)
why did you put f(2) = 2 ???
f(2) is -26

Answer 8

well isn't is 3 - 1? so 4 x 2?

Answer 9

its f(3-1)
not 3-1

Answer 10

so -4 x 3 - 1 - 3 x 3 - 2?

Answer 11

i do not understand..

Answer 12

why don't you use f(2) = -26 ?

Answer 13

where do i use that?

Answer 14

Im sorry i do not remember how to do this.

Answer 15

f(n) = -4•f(n -1) - 3•f(n - 2)
f(3) = -4 f(2) - 3 f(1)
here
f(2) = -26
f(1) =8

Answer 16

ohhhh!!!

f(3) = -4 x -26 - 3 x 8
i got 128...

Answer 17

no
-4 x -26 - 3 x 8 = 80

Answer 18

oh yea i for got to subtract sorry...

Answer 19

so its the second one!!!
lol im so stupid sorr for wasting so much of your time...

Answer 20

yes, 2nd one.
no problem :)