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lawls

  • one year ago

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

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  1. amistre64
    • one year ago
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    looks like a pascal

  2. amistre64
    • one year ago
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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

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

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

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

  6. amistre64
    • one year ago
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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

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

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

  9. amistre64
    • one year ago
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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

  10. lawls
    • one year ago
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    ok thanks

  11. amistre64
    • one year ago
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    good luck ;)

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