SOLUTION: Find an for the arithmetic sequence with a4 = 12 and the common difference is 2.

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Question 1096298: Find an for the arithmetic sequence with a4 = 12 and the common difference is 2.
Answer by ikleyn(52788) About Me  (Show Source):
You can put this solution on YOUR website!
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a3 = 12 - 2 = 10.

a2 = 10 - 2 =  8.

a1 =  8 - 2 =  6.


So, your progression starts from 6 and each next term is 2 units more than the current term.


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There is a bunch of introductory lessons on arithmetic progressions in this site:
    - Arithmetic progressions
    - The proofs of the formulas for arithmetic progressions
    - Problems on arithmetic progressions
    - Word problems on arithmetic progressions
    - Solved problems on arithmetic progressions


Also,  you have this free of charge online textbook in ALGEBRA-II in this site
    - ALGEBRA-II - YOUR ONLINE TEXTBOOK.

The referred lessons are the part of this online textbook under the topic "Arithmetic progressions".


Save the link to this textbook together with its description

Free of charge online textbook in ALGEBRA-II
https://www.algebra.com/algebra/homework/complex/ALGEBRA-II-YOUR-ONLINE-TEXTBOOK.lesson

into your archive and use when it is needed.