Question

Write four term of an when the first term is 4 and the common is -3​

Answer 1

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QUESTION:

Write four term of an when the first term is 4 and the common is -3.

ANSWER:

❭ Let d be the common difference.

❭ The sum of the first 12 terms is then

4+(4+d)+(4+2d)+(4+11d)

❭ Recall now the key fact that the sum of the first n integers is (n+1)n2.

❭ Obviously you can write the expression for the sum of the first 8 terms similarly and it should now reduce just to arithmetic.

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