Chapter 1 Section 1-2 An Application of Inductive Reasoning: Number Patterns © 2008 Pearson Addison-Wesley. All rights reserved.

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Chapter 1 Section 1-2 An Application of Inductive Reasoning: Number Patterns © 2008 Pearson Addison-Wesley. All rights reserved

An Application of Inductive Reasoning: Number Patterns Number Sequences Successive Differences Number Patterns and Sum Formulas Figurate Numbers © 2008 Pearson Addison-Wesley. All rights reserved

© 2008 Pearson Addison-Wesley. All rights reserved Number Sequences Number Sequence A list of numbers having a first number, a second number, and so on, called the terms of the sequence. Arithmetic Sequence A sequence that has a common difference between successive terms. Geometric Sequence A sequence that has a common ratio between successive terms. © 2008 Pearson Addison-Wesley. All rights reserved

Successive Differences Process to determine the next term of a sequence using subtraction to find a common difference. © 2008 Pearson Addison-Wesley. All rights reserved

Example: Successive Differences Use the method of successive differences to find the next number in the sequence. 14, 22, 32, 44,... 14 22 32 44 8 10 12 Find differences 2 2 Find differences 58 14 2 Build up to next term: 58 © 2008 Pearson Addison-Wesley. All rights reserved

Number Patterns and Sum Formulas Sum of the First n Odd Counting Numbers If n is any counting number, then Special Sum Formulas For any counting number n, © 2008 Pearson Addison-Wesley. All rights reserved

© 2008 Pearson Addison-Wesley. All rights reserved Example: Sum Formula Use a sum formula to find the sum Solution Use the formula with n = 48: © 2008 Pearson Addison-Wesley. All rights reserved

© 2008 Pearson Addison-Wesley. All rights reserved Figurate Numbers © 2008 Pearson Addison-Wesley. All rights reserved

Formulas for Triangular, Square, and Pentagonal Numbers For any natural number n, © 2008 Pearson Addison-Wesley. All rights reserved

Example: Figurate Numbers Use a formula to find the sixth pentagonal number Solution Use the formula with n = 6: © 2008 Pearson Addison-Wesley. All rights reserved

© 2008 Pearson Addison-Wesley. All rights reserved Figurate Numbers Hexagonal Numbers 1 6 15 28 45   © 2008 Pearson Addison-Wesley. All rights reserved

Example: Figurate Numbers Use a formula to find the seventh hexagonal number Solution Use the formula with n =7: © 2008 Pearson Addison-Wesley. All rights reserved

© 2008 Pearson Addison-Wesley. All rights reserved Figurate Numbers   Triangular Numbers Do you see the pattern? What would the formula be for Octagonal Numbers?   Square Numbers   Pentagonal Numbers   Hexagonal Numbers © 2008 Pearson Addison-Wesley. All rights reserved

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