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anonymous

  • one year ago

find an equation for the nth term of the geometric sequence where the second and fifth terms are -8 and 512, respectively. A. an=2*(-4)^n+1 B. an=2*4^n-1 C. an=2*(-4)^n-1 D. an=2*4^n @dan815 @michele_laino @nincompoop @campbell @paki @nnesha @e.mccormick

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  1. anonymous
    • one year ago
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    @ash2326 @welshfella @KyanTheDoodle @mathmath333 @misssunshinexxoxo

  2. welshfella
    • one year ago
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    if a1 is the first term and r = common ratio second term = a1r = -8 fifth term = a1r^4 = 512 dividing a1r^4 / a1r = 512/-8 r^3 = -64 therefor r = -4

  3. welshfella
    • one year ago
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    now you can see that a1*-4 = -8 so now you can find what a1 is

  4. anonymous
    • one year ago
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    would it be c?

  5. welshfella
    • one year ago
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    nth term = a1r^(n-1) so an = 2*(-4)^(n-1)

  6. welshfella
    • one year ago
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    yea c is correct

  7. anonymous
    • one year ago
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    can u help me with another one?

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