Math Problem Statement

Given an explicit equation f(n) = 4n + 6, find the recursive equation and calculate the value for term 50.

Solution

Let's break this down:

The explicit equation given is:
f(n)=4n+6f(n) = 4n + 6

From this, we can calculate the values in the sequence based on the term number nn. For example:

  • For n=1n = 1, f(1)=4(1)+6=10f(1) = 4(1) + 6 = 10
  • For n=2n = 2, f(2)=4(2)+6=14f(2) = 4(2) + 6 = 14

The table indicates the sequence continues similarly for higher terms, like term #50.

Recursive Equation:

You need to write the recursive equation for this sequence.

The general recursive form is: f(n)=f(n1)+df(n) = f(n-1) + d where dd is the common difference.

Looking at the sequence values (10, 14, ...), the common difference dd between terms is 4: d=1410=4d = 14 - 10 = 4

Thus, the recursive formula is: f(n)=f(n1)+4f(n) = f(n-1) + 4

The start value (base case) is the first term: f(1)=10f(1) = 10

So, the recursive equation becomes: f(n)=f(n1)+4 with f(1)=10f(n) = f(n-1) + 4 \text{ with } f(1) = 10


Do you want more details or have any questions? Here are five related questions for deeper understanding:

  1. How would the recursive equation change if the common difference were negative?
  2. Can you derive the 50th term using both the explicit and recursive formulas?
  3. How does the initial condition f(1)f(1) influence the recursive sequence?
  4. What is the relationship between the explicit and recursive formulas in arithmetic sequences?
  5. How would you explain the difference between an arithmetic and a geometric sequence?

Tip: In arithmetic sequences, the common difference dd remains constant between terms, which simplifies the recursive formula significantly!

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Math Problem Analysis

Mathematical Concepts

Arithmetic Sequence
Recursive Formula
Explicit Formula

Formulas

Explicit formula: f(n) = 4n + 6
Recursive formula: f(n) = f(n-1) + d

Theorems

Arithmetic Sequence

Suitable Grade Level

Grades 8-10