Answered

Welcome to Westonci.ca, where your questions are met with accurate answers from a community of experts and enthusiasts. Join our platform to connect with experts ready to provide precise answers to your questions in various areas. Discover in-depth answers to your questions from a wide network of professionals on our user-friendly Q&A platform.

in an arithmetic sequence, the sum of the first n terms is s_n=n^2. find a_8
i'm not sure how to do this, so yeah

Sagot :

Answer:

[tex]a_{8} = 15[/tex]

Step-by-step explanation:

[tex]a_{1} + a_{2} + ..... + a_{7} + a_{8} = 8^{2} = 64[/tex]

[tex]-a_{1} - a_{2} ..... - a_{7} = - 7^{2} = -49[/tex]    Now add the two equations

                                 [tex]a_{8} = 64 - 49 = 15[/tex]

[tex]a_{8} = 15[/tex]

We hope our answers were helpful. Return anytime for more information and answers to any other questions you may have. Thanks for using our platform. We aim to provide accurate and up-to-date answers to all your queries. Come back soon. Westonci.ca is here to provide the answers you seek. Return often for more expert solutions.