Question

The following function defines a recursive sequence.

f(0) = -5

f(1) = 20

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

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

-5, -20, -65, -200, …

-5, 20, -92, 372, …

-5, -24, -92, -372, …

-5, 20, -65, 200, …

Answer 1

Any ideas?

Answer 2

i was thinking D

Answer 3

why?

Answer 4

if i knew i wouldnt be on here, lol, its a guess.

Answer 5

ITs C
probabily

Answer 6

Is it obvious that the answer is either B or D?

Answer 7

I dont even know, D stuck out to me

Answer 8

Yeah I suck at math too...

Answer 9

because the first two numbers are -5 an 20

Answer 10

i guess so ... so is it D ?

Answer 11

f(0) = -5

f(1) = 20

Answer 12

So you need to compute f(2) using the given formula

Answer 13

ok ...

Answer 14

f(n) = -4•f(n -1) - 3•f(n - 2)

f(2) = -4 * f(2-1) - 3 *f (2-2)

f(2) = -4 * f(1) - 3 * f(0)

Answer 15

ok..

Answer 16

Is this making sense?

Answer 17

not at all, looks like a different language, trying to explain it is pointless /:

Answer 18

You are right, math is a different language :)

Answer 19

A language of symbols.

Answer 20

Take this formula $$f(2) = -4 * f(1) - 3 * f(0)$$ that I derived for you and substitute the values given from the question please.

Answer 21

Remember:
f(0) = -5

f(1) = 20

Answer 22

i dont understand anything you just typed dude

Answer 23

im putting D, i hope its the right answer

Answer 24

Good guess.

Answer 25

i hope it is

Answer 26

Do you want to really try hard and understand this, if so I will explain it to you?

Answer 27

it was right and no thanks

Answer 28

@yeah_i_suck_at_math Do you still care?