12.5 – Sigma Notation

Quick Notes about the test

All formulas will be given to you Mainly a 1 day test – Wed, 3/9 The Ratio Test will be on it:

Just 1 question We will take that one question on Tuesday

during the last 15 minutes of class.

Vocabulary

k

nna

1

maximum valueof n

starting valueof n

expression forgeneral term

Sigma – “take the

sum of…”

Read: “the summation from n = 1 to k of an”

Write the expression in expanded form and then find the sum.

7

4

13b

b

= 80 + 242 + 728 + 2186

= 3236

Write the expression in expanded form and then find the sum.

= -5 + -3 + -1 + 1

= -8

4

1

72n

n

Express each series using sigma notation.

1. -8 + 4 – 2 + 1

2. 6 + 9 + 12 + …+ 33

Exit Slip

• Rip a piece of paper in half.

• This must be completed by yourself.

• Turn it over when you are finished.

• You have 5 minutes.

• You may use your notes.

Write the following series in sigma notation.

1. 3 + 6 + 12 + 24 + 48

2. 10 + 8 + 6 + … + -4