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How to Find the Nth Term: Quadratic and Other Sequences Explained for Kids

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How to Find the Nth Term: Quadratic and Other Sequences Explained for Kids

The document provides an overview of different types of sequences, focusing on quadratic sequences and their nth term formulas. It covers arithmetic, geometric, Fibonacci, square, and triangular numbers, explaining their characteristics and providing examples. The text also details methods for finding the nth term of linear and quadratic sequences, including step-by-step explanations and examples.

25/06/2022

760

Quadratic Sequences
Arithmetic/Line
difference between consecutive numbers
18
Quadratic-2nd difference between consecutive numbers is
4, 25

View

Quadratic Sequences and Other Sequence Types

This page provides a comprehensive overview of various sequence types, with a focus on quadratic sequences and methods for finding their nth terms. It covers essential concepts in sequence analysis, making it valuable for students studying mathematics.

The document begins by introducing different types of sequences:

  1. Arithmetic (Linear) Sequences: These have a constant difference between consecutive terms.

  2. Quadratic Sequences: The second difference between consecutive terms is constant.

  3. Geometric Sequences: Each term after the first is found by multiplying the previous one by a fixed, non-zero number called a common ratio.

  4. Fibonacci Sequence: Each number is the sum of the two preceding ones.

  5. Square Numbers: The product of an integer with itself.

  6. Triangular Numbers: A series obtained by continued summation of natural numbers.

Definition: A quadratic sequence is a sequence where the second difference between consecutive terms is constant.

The page then delves into the methods for finding the nth term of sequences:

For linear sequences:

  • The document provides an example of finding the nth term, explaining how to use the common difference to formulate the expression.

Example: For the sequence 6, 12, 18, 24, the nth term is 6n.

For quadratic sequences:

  • The general rule for the nth term of a quadratic sequence is presented as an² + bn + c.
  • A step-by-step method for finding the values of a, b, and c is demonstrated.

Highlight: The second difference in a quadratic sequence is always twice the 'a' value in the nth term formula.

The document concludes with an alternative method for finding the nth term of quadratic sequences by comparison, using square numbers as an example.

Example: For the sequence 9, 16, 25..., the nth term is T(n) = n².

This comprehensive guide serves as an excellent resource for students learning about finding the nth term of a quadratic sequence and other sequence types, providing clear explanations and practical examples.

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Knowunity has been named a featured story on Apple and has regularly topped the app store charts in the education category in Germany, Italy, Poland, Switzerland, and the United Kingdom. Join Knowunity today and help millions of students around the world.

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Knowunity is the #1 education app in five European countries

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Lena, iOS user

I love this app ❤️ I actually use it every time I study.

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How to Find the Nth Term: Quadratic and Other Sequences Explained for Kids

The document provides an overview of different types of sequences, focusing on quadratic sequences and their nth term formulas. It covers arithmetic, geometric, Fibonacci, square, and triangular numbers, explaining their characteristics and providing examples. The text also details methods for finding the nth term of linear and quadratic sequences, including step-by-step explanations and examples.

25/06/2022

760

 

11/9

 

Maths

29

Quadratic Sequences
Arithmetic/Line
difference between consecutive numbers
18
Quadratic-2nd difference between consecutive numbers is
4, 25

Quadratic Sequences and Other Sequence Types

This page provides a comprehensive overview of various sequence types, with a focus on quadratic sequences and methods for finding their nth terms. It covers essential concepts in sequence analysis, making it valuable for students studying mathematics.

The document begins by introducing different types of sequences:

  1. Arithmetic (Linear) Sequences: These have a constant difference between consecutive terms.

  2. Quadratic Sequences: The second difference between consecutive terms is constant.

  3. Geometric Sequences: Each term after the first is found by multiplying the previous one by a fixed, non-zero number called a common ratio.

  4. Fibonacci Sequence: Each number is the sum of the two preceding ones.

  5. Square Numbers: The product of an integer with itself.

  6. Triangular Numbers: A series obtained by continued summation of natural numbers.

Definition: A quadratic sequence is a sequence where the second difference between consecutive terms is constant.

The page then delves into the methods for finding the nth term of sequences:

For linear sequences:

  • The document provides an example of finding the nth term, explaining how to use the common difference to formulate the expression.

Example: For the sequence 6, 12, 18, 24, the nth term is 6n.

For quadratic sequences:

  • The general rule for the nth term of a quadratic sequence is presented as an² + bn + c.
  • A step-by-step method for finding the values of a, b, and c is demonstrated.

Highlight: The second difference in a quadratic sequence is always twice the 'a' value in the nth term formula.

The document concludes with an alternative method for finding the nth term of quadratic sequences by comparison, using square numbers as an example.

Example: For the sequence 9, 16, 25..., the nth term is T(n) = n².

This comprehensive guide serves as an excellent resource for students learning about finding the nth term of a quadratic sequence and other sequence types, providing clear explanations and practical examples.

Can't find what you're looking for? Explore other subjects.

Knowunity is the #1 education app in five European countries

Knowunity has been named a featured story on Apple and has regularly topped the app store charts in the education category in Germany, Italy, Poland, Switzerland, and the United Kingdom. Join Knowunity today and help millions of students around the world.

Ranked #1 Education App

Download in

Google Play

Download in

App Store

Knowunity is the #1 education app in five European countries

4.9+

Average app rating

15 M

Pupils love Knowunity

#1

In education app charts in 12 countries

950 K+

Students have uploaded notes

Still not convinced? See what other students are saying...

iOS User

I love this app so much, I also use it daily. I recommend Knowunity to everyone!!! I went from a D to an A with it :D

Philip, iOS User

The app is very simple and well designed. So far I have always found everything I was looking for :D

Lena, iOS user

I love this app ❤️ I actually use it every time I study.