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VCabral1134

  • one year ago

Help me plz will fan and give medal! Write the explicit formula for the geometric sequence. Then find the fifth term in the sequence. a^1 = −3, a^2 = 15, a^3 = −75 a. an = −3 ⋅ (−5)n ; 9375 c. an = −3 ⋅ (5)n ; –1875 b. an = −5 ⋅ (−3)n − 1 ; –405 d. an = −3 ⋅ (−5)n − 1 ; –1875

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  1. Nnesha
    • one year ago
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    \[\huge\rm a_n = a_1 \times r^{n-1}\] equation to find nth term of geometric seq. where a_1 is first term r= ratio n= term that u need

  2. VCabral1134
    • one year ago
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    thank you

  3. Nnesha
    • one year ago
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    to find common ratio divide next term with the previous one \[\large\rm r=\frac{ a_2 }{ a_1}~~or~~\frac{ a_3 }{ a_2} \]

  4. Nnesha
    • one year ago
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    a_2 = 2nd term a_3 = 3rd term

  5. VCabral1134
    • one year ago
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    r=-5

  6. VCabral1134
    • one year ago
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    D @Nnesha

  7. VCabral1134
    • one year ago
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    Am I right??

  8. Nnesha
    • one year ago
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    let me check wait a sec

  9. VCabral1134
    • one year ago
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    ok

  10. Nnesha
    • one year ago
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    right

  11. VCabral1134
    • one year ago
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    Yay!!

  12. Nnesha
    • one year ago
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    yahoo!

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