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The sum of first 6terms of an 6.The product of second term and fifth term is -80.Find the terms of A.P.

  • maths -

    (6/2)(2a+5d) = 6
    (a+d)(a+4d) = -80


    2a+5d = 2
    a^2+5ad+4d^2 = -80

    Now just solve for a and d. One sequence is

    -14, -8, -2, 4, 10, 16
    sum = 6
    (-8)(10) = -80

    There is another value for a as well

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