Determine o 1° termo e a razao de cada PA na qual : a) a8 = -4 e a12 = 0

Determine o 1° termo e a razao de cada PA na qual : a) a8 = -4 e a12 = 0

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    Determine o 1 termo e a razao de cada PA na qual : a) a8 = -4 e a12 = 0

    a1 + 11r = a12
    a1 + 7r = a8

    a1 + 11r = 0 ==> a1 + 11r = 0
    a1 + 7r = -4(-1) ==> -a1 — 7r = 4

    4r = 4
    r = 1

    a1 + 11r = 0

    a1 = — 11r ==> a1 = — 11.(1)
    a1= -11

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    Para descobrir a razo:

    a=-4
    a=0
    _________
    a+7r=-4
    a+11r=0
    _________
    -4r=-4 *(-1)
    4r=4
    r=4/4
    r=1

    Com isso, sei que a razo igual a 1

    Para descobrir a:

    a+7r=-4
    a+7*1=-4
    a=-4-7
    a=-11

    Logo, o primeiro termo -11 e a razo 1


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