Arithmetic Sequences & Partial Sums Pre-Calculus Lesson 9.2.

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Presentation transcript:

Arithmetic Sequences & Partial Sums Pre-Calculus Lesson 9.2

An Arithmetic Sequence is a sequence whose consecutive terms have a common difference, d.

5. Find the first three terms of the arithmetic sequence with a 1 = 300 and d = Find the first three terms of the arithmetic sequence with a 1 = 220 and d = -25.

a n = a 1 + (n – 1)d To find the nth term of an arithmetic sequence with first term a 1 and common difference d, use the following formula

7. Write a formula for the general term of the arithmetic sequence 2, 7, 12, 17…

8. Find the eighth term of the arithmetic sequence whose first term is 4 and whose common difference is – Find the ninth term of the arithmetic sequence that begins with 2 and Find a 6 when a 1 = 13 and d = 4.

Sum of a Finite Arithmetic Sequence, called S n :

11.Find the sum: Find the sum of the integers from 1 to 100.

13.Find the 150 th partial sum of the arithmetic sequence: 5, 16, 27, 38, 49…

14. Find the following sum: