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lawls

Find the 7th term of (x^2 + 3y)^9

  • one year ago
  • one year ago

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  1. amistre64
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    looks like a pascal

    • one year ago
  2. amistre64
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    given: \[(p+q)^n\] we can work out the middle stuff as:\[p^{n-c}q^c\] the coeeficient is a little tricker unless you know about combinatorics

    • one year ago
  3. amistre64
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    and c is the "term" value :)

    • one year ago
  4. amistre64
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    n choose c is what i think i recall for the coeff; or else draw up the pascal triangle

    • one year ago
  5. shubhamsrg
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    |dw:1358788894374:dw| This is the working formula.

    • one year ago
  6. amistre64
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    that looks about right, but if i remember it correctly: the first term starts at 9 and drops down till it hits the 7th term

    • one year ago
  7. shubhamsrg
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    Didn't get you ?

    • one year ago
  8. shubhamsrg
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    The first term's coefficient is 1 , when r=0,

    • one year ago
  9. amistre64
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    (a+b)^9 a^9 a^8 a^7 a^6 a^5 a^4 a^3 ^^^ b^0 b^1 b^2 .... b^6 ^^^ these always get turned around in my head

    • one year ago
  10. lawls
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    ok thanks

    • one year ago
  11. amistre64
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    good luck ;)

    • one year ago
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