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March 25, 2017

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determine the secon termof an A.P whose sixth term is 12 and eighth term is 22?

  • arithmetic - ,

    a(n) = a₁ +(n-1)d

    a(6) = a₁ +(6-1)d=12
    a(8) = a₁ +(8-1)d=22

    a₁ +5d=12
    a₁ +7d=22
    a₁ = -13
    d=5
    a(2) = a₁ +(2-1)d=
    =-13 +5= =-8

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