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anonymous

  • 5 years ago

What is the coefficient of the fifth term in the expansion of (x+1)^8 ?

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  1. amistre64
    • 5 years ago
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    youd have to expand it out to tell, unless someone knows a shortcut :)

  2. amistre64
    • 5 years ago
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    i might know a short cut......

  3. amistre64
    • 5 years ago
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    the binomial therum or some such name...... pascals triangle

  4. amistre64
    • 5 years ago
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    1 11 121 1331 14641 1 5 10 10 5 1 that stuff

  5. anonymous
    • 5 years ago
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    i don't know pascals triangle

  6. amistre64
    • 5 years ago
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    11^8 would work too :)

  7. anonymous
    • 5 years ago
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    how did you get the 11?

  8. anonymous
    • 5 years ago
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    i'm so confused!

  9. amistre64
    • 5 years ago
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    pascals triangle follow a pattern of the powers of 11 11^2 is the quadratic cooeficients 1 2 1 11^3 is the cubics cooefficients..1 3 3 1 and so on 11^8 = 214358881 but I have to pick it out into the right pattern

  10. amistre64
    • 5 years ago
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    1 11 121 1331 14641 15101051 1 6 15 20 15 6 1 1 7 21 35 35 21 7 1 1 8 28 56 70 56 28 8 1 the 5th cooeficient will be 70

  11. amistre64
    • 5 years ago
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    in fact this is all the cooefficients :)

  12. anonymous
    • 5 years ago
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    use Pascals Triangle to find out the fifth coeficent

  13. amistre64
    • 5 years ago
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    good answer :)

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