+0  
 
+1
79
3
avatar+555 

I don't understand how to find a sigma equation from a set of numbers.

 

 

-5+2+9+16+...+261+268

 

 

How do I get a sigma equation from this?

OfficialBubbleTanks  Feb 23, 2018
Sort: 

3+0 Answers

 #1
avatar+555 
0

Oh wait, nobody is online. LOVELY! >:(

OfficialBubbleTanks  Feb 23, 2018
 #2
avatar+12266 
+2

\(\sum_{1}^{40}\) 7n-12

ElectricPavlov  Feb 23, 2018
 #3
avatar+92458 
+1

 

My answer is the same as EP's

EP you might like to look at my Latex here too :)

 

 

 

-5+2+9+16+...+261+268

This is the sum of an AP

a=-5, d=7,   

 

\(T_n=a+(n-1)d\\ T_n=-5+(n-1)*7\\ T_n=-5+7n-7\\ T_n=7n-12\\ Find\;n\;when\;T_n=268\\ 268=7n-12\\ 280=7n\\ n=40 \)

 

\(\displaystyle\sum_{n=1}^{40}\;7n-12 \\\)

---------------------

 

LATEX COMMAND

\displaystyle\sum_{n=1}^{40}\;7n-12 

Melody  Feb 24, 2018

30 Online Users

avatar
avatar
avatar
New Privacy Policy (May 2018)
We use cookies to personalise content and ads, to provide social media features and to analyse our traffic. We also share information about your use of our site with our social media, advertising and analytics partners.  Privacy Policy