Interpreting recursive equations to write a sequence

G of two is gonna be one half times G of one, which is, of course, This will give us Notice how much easier it is to work with the explicit formula than with the recursive formula to find a particular term in a sequence.

To find out if is a term in the sequence, substitute that value in for an. And then g of four, well, we fall here again. We just figured that out. Find the explicit formula for 15, 12, 9, 6.

And then times one half to the N. Fourth term, we multiply by one half three times. Then you have to recurse backwards to eventually get to a base case. And we could keep going on and on and on like that.

Recursive Sequences

Find the recursive formula for 5, 9, 13, 17, 21. So the explicit or closed formula for the arithmetic sequence is. Times one half to the N. If we do not already have an explicit form, we must find it first before finding any term in a sequence. So, times one half. Find a10, a35 and a82 for problem 4.

What does this mean? Negative four plus negative 10 is negative Examples Find the recursive formula for 15, 12, 9, 6. G of three is gonna be one half times G of two, which it is, G of three is one half times G of two.

So we add 3. Find the explicit formula for 5, 9, 13, 17, 21. What happens if we know a particular term and the common difference, but not the entire sequence?

Well, if is a term in the sequence, when we solve the equation, we will get a whole number value for n.While recursive sequences are easy to understand, they are difficult to deal with, in that, in order to get, say, the thirty-nineth term in this sequence, you would first have to find terms one through thirty-eight.

There isn't a formula into which you could plug n. Sal shows how to evaluate a sequence that is defined with a recursive formula. This definition gives the base case and then defines how to. Learn how to find recursive formulas for arithmetic sequences.

Explicit & recursive formulas for geometric sequences

For example, find the recursive formula of 3, 5, 7, If you're seeing this message, it means we're having trouble loading external resources on our website.

same sequence. Recursive formula Explicit formula u 0 5 u n 5 7n u n u n 1 you will use x and y to write linear equations and n and u n to write recursive and explicit formulas for sequences of discrete points. Investigation: Match Point Lesson † Linear Equations and Arithmetic Sequences (continued).

Then he explores equivalent forms the explicit formula and finds the corresponding recursive formula. Recursive formulas for geometric sequences. Practice: Explicit formulas for geometric sequences And you can think of it in other ways, you could write this as G of N is equal to, let's see, one way you could write it, as, you could.

Evaluating sequences in recursive form

So once you know the common difference in an arithmetic sequence you can write the recursive form for that sequence. However, the recursive formula can become difficult to work with if we want to find the 50 th term.

Using the recursive formula, we would have to know the first 49 terms in order to find the 50 th. This sounds like a lot of work.

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Interpreting recursive equations to write a sequence
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