Help Solve Math Homework Qs -3, -1, 1 & CD 2

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Homework Help Overview

The discussion revolves around a math homework problem involving sequences and series, specifically focusing on summing expressions related to arithmetic series.

Discussion Character

  • Exploratory, Conceptual clarification

Approaches and Questions Raised

  • Participants explore the interpretation of the problem, particularly the summation of an expression defined for a range of values. Questions arise regarding the understanding of the arithmetic series and the initial attempts at solving the problems.

Discussion Status

Some participants have provided insights into the nature of the arithmetic series involved, while others are still seeking clarification on how to approach the problems. There is an ongoing exploration of the concepts without a clear consensus on the solutions.

Contextual Notes

The original poster expresses confusion about one of the questions, indicating a lack of understanding that may hinder progress. There is also a reference to a formula that may be relevant to the discussion, but it has not been explicitly stated.

Skaterkid
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Homework Statement




http://puu.sh/ajGv


Homework Equations



??


The Attempt at a Solution



Q1- is -3, -1 and 1
Q2- CD is 2
Q3- I don't understand hence can't even start it
 
Last edited by a moderator:
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That expression just means what is the sum of 2r-5 from r=1 up to n. So, what is

(2(1)-5)+(2(2)-5)+(2(3)-5)+...+(2(n)-5)

You should have been given a formula to calculate the sum of an arithmetic series.
 
use the following:


arithmetic%20sum%20formula1.gif
 
Did you reach your answer yet?
 

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