HELP I don't understand.

Question

izzy18970 · Answer

https://irsc.agilemind.com/LMS/content/work/05a2_21_SequencesSeries/resources/05a221_SequencesSeries_SAS1-student.pdf

izzy18970 · Answer

#4 c,d,e

anonymous · Answer

Oh wow that's cool! I'm working on a problem exactly like that for my homework right now :D. As I do it ill try to help

izzy18970 · Answer

thank you

anonymous · Answer

4 c part
you have to find the first 4 terms, but you are already given the first 2 terms, so only 2 more terms to find, f(3) and f(4)
Given:
$$f(1)=2$$$$f(2)=5$$
$$f(n)=2f(n-2)+f(n-1)$$
We have to find:
$$f(3)=?$$
$$f(4)=?$$
Let's start with f(3),
Put 3 in place of every n as you do in a function
$$f(3)=2f(3-2)+f(3-1)$$
Simplify it a little
$$f(3)=2f(1)+f(2)$$
Now you are already given f(1) and f(2) so put their values in the equation and you'll get the answer
similarly f(4) can be determined

izzy18970 · Answer

I get 7 for f(3) is that correct?

anonymous · Answer

hmm Nope

izzy18970 · Answer

I input it into the calculator like that and i got 7

izzy18970 · Answer

How do I solve it without a calculator? like step by step

izzy18970 · Answer

The teacher didnt teach us, and this is my first day so I have no idea how to solve it when it comes to breaking down the equation to solve the problem.

anonymous · Answer

u just put the values in place of f(1) and f(2)