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Mathematics 9 Online
OpenStudy (anonymous):

Can you tell me if my answers are correct? : Write the first five terms of the sequence. (I've posted the equation and my answers below)

OpenStudy (anonymous):

hartnn (hartnn):

yes, all 5 terms are correct :)

OpenStudy (anonymous):

holy cow! I'm so proud of myself :') Thank you for checking it for me!

OpenStudy (anonymous):

Can you help me with one that I really don't know how to do?

hartnn (hartnn):

lol, you did good work! even i am proud of you :) welcome ^_^ sure, do ask!

OpenStudy (anonymous):

hartnn (hartnn):

do you realise, there ia pattern in that sequence ?

hartnn (hartnn):

**is a

OpenStudy (anonymous):

+3

hartnn (hartnn):

so, its an arithmetic sequence, right ? do you know the general form of n'th term ?

hartnn (hartnn):

seen something like \(\large a_n =a_1+(n-1)d \) ?

OpenStudy (anonymous):

no, never seen that. but ill go along with it, haha.

hartnn (hartnn):

yup, that the one to be used here. a1 = 1st term = ... ? n = the general n'th term d= common difference can u find these ?

OpenStudy (anonymous):

an=5+(n-1)3

OpenStudy (anonymous):

or is it an=5+(n-1)+3 because its going up by three?

hartnn (hartnn):

correct :) now simplify that

OpenStudy (anonymous):

the first one?

OpenStudy (anonymous):

i tried simplifying, but it doesn't work with the numbers.

hartnn (hartnn):

an =5+(n-1)3 = 5+ 3n -3 = 2 +3n

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