Lesson 4.3: Using Recursive Formulas

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Transcript Lesson 4.3: Using Recursive Formulas

Lesson 4.3: Using Recursive
Formulas
Advanced Math Topics
Definition of Recursive Formula
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The formula for a sequence that
tells you how to find the nth term
from the term(s) before it.
Example/Steps
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Part 1: the value of the 1st term(s) are
given
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Part 2: A recursion equation shows how
to find each term from the term before it.
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a1 = 1
an=2an-1
Part 3: Plug numbers into the formula to
find the next terms in the sequence.
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a2=2a2-1=2a1=2(1)=2
a3=2a3-1=2a2=2(2)=4
a4=2a4-1=2a3=2(4)=8
Examples
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a1=12
an=3(an-1)
n
Examples
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a1=3
a2=2
an=an-1-2an-2
Examples
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a1=1
a2=2
an=(an-2)2-(an-1)2
Examples
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a1=10
an= 1
an-1
Word Problem
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Start January by plugging in 0 for
an-1 and then fill in chart
Homework
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Page 225/ 8-13
Remember that i is an imaginary
number and i2 = -1