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Math Help - arithmetic progession

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    arithmetic progession

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    find the first eight numbers of the arithmetic sequence in which the sum of the first and seventh terms is 40 and the product of the first and fourth terms is 160
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    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by rutheada000 View Post
    Show work if any

    find the first eight numbers of the arithmetic sequence in which the sum of the first and seventh terms is 40 and the product of the first and fourth terms is 160
    we cannot give you a full solution, of course, because you have to hand this in. i will give you a hint.

    recall that the terms of an arithmetic series are of the form

    a_n = a_1 + (n - 1)d for n = 1,2,3,...

    where a_n is the nth term, n is the current number of the term, a_1 is the first term, and d = a_2 - a_1 = a_3 - a_2 = ... is the common difference.

    use that to find the formula for the first 8 terms, then formulate them as the question asked to find what the question asked for



    example, the first term is a_1

    the second is a_2 = a_1 + d

    the third is ...
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