Writing Geometric Sequences

Presentation

•

Mathematics

•

9th Grade

•

Practice Problem

•

Hard

•

CCSS

HSF.BF.A.2, HSF.LE.A.2

Standards-aligned

Jala Hawkins

Used 607+ times

FREE Resource

7 Slides • 10 Questions

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Make sure you completed the Do Now in Illuminate

titled: "Algebra 1 Unit 4 Quiz"

IT'S ONLY 2 QUESTIONS

Writing Geometric Sequences

By Jala Hawkins

F.IF.3: I can identify, write, and create geometric sequences.

uses multiplication / division
common ratio
exponential functions

Geometric (Unit 4)

uses addition/subtraction
common difference
linear functions

Arithmetic (Unit 2)

Arithmetic vs Geometric Sequences

Make sure you know the key differences

Fill in the Blanks

A sequence that has a common difference

Type answer...

Fill in the Blanks

A sequence that has a common ratio

Type answer...

How to find common ratio?

3, 6 , 12, 24, 48, ...

Ask yourself: What are they multiplying by each time to get to the next number? 3 * _ = 6??

Take one number and divide it by the one before it! example: 24/12

Both ways get us a common ratio of

Multiple Choice

What is the common ratio?

-2

Not enough information

Multiple Choice

What is the common ratio?

-5

Not enough information

Multiple Choice

Find the common ratio for the geometric sequence.

-2

1/2

-1/2

Multiple Choice

What is a₅?

-1875

-550

-1055

Not enough information

Multiple Choice

What is a₅ ?

-64

-24

-32

Not enough information

Explicit:

We only need to find a₁(first term) and r(common ratio)

How to write formulas for geometric sequences

Some text here about the topic of discussion

Multiple Choice

What is the explicit expression that represents how many strings are included based on the number of steps?

$\frac{1}{2}n+2$

$-n+2$

$\frac{1}{2}n$

$4\left(\frac{1}{2}\right)^n$

Multiple Choice

Write the explicit formula for the geometric sequence.

a_n = 10(2)^n-1

a_n = 2(10)^n-1

a_n = 10(2)ⁿ

a_n = 2(10)ⁿ

Multiple Choice

Write the explicit formula for the geometric sequence.

a_n = 4(3)^n-1

a_n = 3(4)^n-1

a_n = -4(3)^n-1

a_n = 3(-4)^n-1

Goal Setting Assignments
Algebra 1 Pop Quiz
HW1: Exponential Equation QuizIzz
HW2: Geometric Sequences in ALEKS

Tasks to Complete

Check Infinite Campus to view your current grade + missing assignments.

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IT'S ONLY 2 QUESTIONS

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