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Casio 991es & Sigma Notation help, please.

I dont know how to use latex and i've only got a min so sorry about the formatting.

a_1=3
a_(n+1)=3a_n-5

that defines my series.

Then I have
5
Sigma (3(a_n)-5)
x=1

[br]a1=3[br][br]a_1=3[br]
[br]an+1=3an−5[br][br]a_{n+1}=3an-5[br]
When inputting this into the calculator, is there any way to specify the starting value? ie a1a_1?
Reply 1
Avatar for nuodai
nuodai
17
What are you trying to calculate? If you have the series with starting value 3 where an+1=3an−5a_{n+1}=3a_n-5 then you can just put 3 into your calculator and use the Ans key in place of ana_n to find an+1a_{n+1}.
Reply 2
Avatar for jt18
jt18
OP
Its the sum of the series that I need to calulate. It was todays exam. But either way, it would be nice to know. Its just how to set the starting value of 3 instead of 1 :smile:
Reply 3
Avatar for Chriz M
Chriz M
10
http://www.thestudentroom.co.uk/wiki/Making_the_Most_of_your_Casio_fx-991ES_Calculator

Look here.

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