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mr Goodwill [35]
3 years ago
9

In an arithmetic sequence, the sum of the first n terms is s_n=n^2. find a_8

Mathematics
1 answer:
Julli [10]3 years ago
4 0

Answer:

a_{8}  = 15

Step-by-step explanation:

a_{1} + a_{2} + ..... + a_{7} + a_{8} = 8^{2} = 64

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

                                 a_{8} = 64 - 49 = 15

a_{8}  = 15

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