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yasmeenabutineh

  • 4 years ago

What is the sum of a 6-term geometric sequence if the first term is 11, the last term is –11,264 and the common ratio is –4?

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  1. dumbcow
    • 4 years ago
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    \[\large s_{n} = \frac{a_{1}(r^{n}-1)}{r-1}\]

  2. dumbcow
    • 4 years ago
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    n =6 a1 = 11 r = -4

  3. dumbcow
    • 4 years ago
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    does that make sense?

  4. yasmeenabutineh
    • 4 years ago
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    sn=11(-4-1)/-4-1?

  5. dumbcow
    • 4 years ago
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    yes except the " -4" on top should be raised to the 6th power

  6. yasmeenabutineh
    • 4 years ago
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    okay so -4^6-1?

  7. dumbcow
    • 4 years ago
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    yep

  8. dumbcow
    • 4 years ago
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    make sure you include the negative sign when raising to power.....-4^6 is different than (-4)^6

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