Question

Medal and fan to the first one who replies

Answer 1

A recursive function is shown below:

f(1) = 5 and f(n) = f(n - 1) - 6; n > 1

Which of the following lists the terms in the sequence defined by this recursive function?

5, 1, 7, 13, 19, ...
5, -1, -7, -13, -19, ...
5, 11, 17, 23, 29, ...
5, -11, -17, -23, -29, ...

Answer 2

It is either the 1st or the 3rd

Answer 3

@dinopyte please help I will give you a medal

Answer 4

hey directrix can you please help

Answer 5

f(1) = 5 ;

Let n = 2.

Then,

f(2) = f(2 - 1) - 6
f(2) = f(1) - 6
f(2) = 5 - 6 = -1

Now, you try f(3), okay?

Answer 6

I dont get it

Answer 7

You have to work by steps or you will get mixed up.

Answer 8

So far, we have f(1) = 5, f(2) = -1

f(n - 1) - 6;
Replace n by 3.

Answer 9

ok so if we r doing f(3) then
n=3 right

Answer 10

No.

Answer 11

whaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa? so what would n=

Answer 12

f(n) = f(n - 1) - 6
Replace n by 3.

f(3) = f(3-1) - 6 = f(2) - 6 = (-1) - 6 = -7

Answer 13

You try f(4).

Answer 14

f(4)= f(4 - 1)-6

Answer 15

is that right

Answer 16

So far so good.

Answer 17

f(4)= f(4 - 1) - 6 = f(3) - 6 = ?

Look up to see what f of 3 is or you'll mess up.

Answer 18

f(2)?

Answer 19

@directrix r u there

Answer 20

Yes.

Answer 21

Read back up the thread to find the value of f(2)

Answer 22

is that to the f(2) or r u there

Answer 23

You need f(3) for your calulation.

Answer 24

f(2)=-1

Answer 25

f(1) = 5 ; Given
f(2) = -1 Computed above
f(3) - -7 Computed above

Answer 26

So, put the value of f(3) here:

f(4)= f(4 - 1) - 6 = f(3) - 6 =

Answer 27

f(4)= f(4 - 1) - 6 = f(3) - 6 = -7?

Answer 28

No but almost.

Answer 29

--7?

Answer 30

f(4)= f(4 - 1) - 6 = f(3) - 6 = -7 Minus 6 =

Answer 31

oh ok so -13?

Answer 32

Correct.

Hey, I messed up the typing of this: f(3) = -7 Computed above. Sorry.

Answer 33

Now, see if you can knock out f(5)

Answer 34

np its ok

Answer 35

f(5)=f(5-1)-6=f(4)= f(4 - 1) - 6 = f(3) - 6 = f(2) - 6 = (-1) - 6 = -7

Answer 36

No. Let's see what went wrong.

Answer 37

f(5)=f(5-1) - 6 = f(4) - 6 = -13 - 6 =

Answer 38

-13 - 6 = -19

Answer 39

What this recursive function does is to do something to the previous term to generate the current term.

In this case, the function just subtracts 6 from the previous term. But, if you mess up the previous term, set of term values will not be right.

Answer 40

@ro561man

Answer 41

Im here its being weird

Answer 42

This site has been acting weird for years but it is acting extra weird lately. Nobody seems to be able to repair it.

Answer 43

@Directrix Yeah I agree, but can we get to the question I don't have much time

Answer 44

oh there u r srry

Answer 45

I thought we had finished.

Answer 46

What is this f(5)=f(5-1) - 6 = f(4) - 6 = -13 - 6 =

Then, pick the answer and close out.

Answer 47

-13 - 6 = what

Answer 48

im still lost I get that you subtract 6 but I dont know if the answer is A or C

Answer 49

That is -19

Here are the terms we computed:

Answer 50

f(1) = 5 ; Given
f(2) = -1 Computed above
f(3) = -7 Computed above
f(4) = -13 Computed above
f(5) = -19 Computed above

Answer 51

oh I see you had to do all the functions then you would get your answer the way it was all set up I got confused sorry we were done

Answer 52

Thank you for the help once again

Answer 53

but can you answer one more

Answer 54

@Directrix r u there

Answer 55

You'll have to start a new thread. This one is too long.

Answer 56

ok

Answer 57

Close and move on.