How do you write a recursive rule

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How do you write a recursive rule

Site Navigation Geometric Sequences This lesson will work with arithmetic sequences, their recursive and explicit formulas and finding terms in a sequence.

Arithmetic Sequences

In this lesson, it is assumed that you know what an arithmetic sequence is and can find a common difference. If you need to review these topics, click here.

This geometric sequence has a common ratio of 3, meaning that we multiply each term by 3 in order to get the next term in the sequence. The recursive formula for a geometric sequence is written in the form For our particular sequence, since the common ratio r is 3, we would write So once you know the common ratio in a geometric 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 50th term. Using the recursive formula, we would have to know the first 49 terms in order to find the 50th.

This sounds like a lot of work. There must be an easier way. Rather than write a recursive formula, we can write an explicit formula. The explicit formula is also sometimes called the closed form.

To write the explicit or closed form of a geometric sequence, we use anis the nth term of the sequence. When writing the general expression for a geometric sequence, you will not actually find a value for this. To find the explicit formula, you will need to be given or use computations to find out the first term and use that value in the formula.

You will either be given this value or be given enough information to compute it. You must substitute a value for r into the formula. For example, when writing the general explicit formula, n is the variable and does not take on a value.

how do you write a recursive rule

But if you want to find the 12th term, then n does take on a value and it would be Your formulas should be simplified if possible, but be very careful when working with exponential expressions. The first term in the sequence is 2 and the common ratio is 3.

This is enough information to write the explicit formula. DO NOT multiply the 2 and the 3 together. Order of operations tells us that exponents are done before multiplication.Visualize Execution Live Programming Mode.

So once you know the common ratio in a geometric sequence you can write the recursive form for that sequence.

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However, the recursive formula can become difficult to work with if we want to find the 50 th term. Recursive sequences can be hard to figure out, so generally they'll give you fairly simple ones of the "add a growing amount to get the next term" or "add the last two or three terms together" type: Find the next number in the sequence: 3, 2, 5, 7, You'll gain access to interventions, extensions, task implementation guides, and more for this instructional video.

In this lesson you will learn how to create a recursive formula by . 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.

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