anonymous
  • anonymous
explain how you can use the pattern for expanding a binomial to expand (x+y+z)^10
Mathematics
jamiebookeater
  • jamiebookeater
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JamesJ
  • JamesJ
This is going to be long a messy in practice although simple in theory. Consider first (x + (y+z) )^10. This is a binomial in x and (y+z). Expand this using standard binomial theory. Then you will need to expand all of the (y+z)^j terms.
JamesJ
  • JamesJ
To work a smaller example, consider (x+y+z)^3. Write this as (x + (y+z) )^3. By the binomial theorem this is equal to x^3 + 3x^2(y+z) + 3x(y+z)^2 + (y+z)^3 Now expand the (y+z) terms x^3 + 3x^2y + 3x^2z + 3xy^2 + 6xyz + 3xz^2 + y^3 + 3y^2z + 3yz^2 + z^3
Zarkon
  • Zarkon
I would just use the multinomial expansion

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JamesJ
  • JamesJ
That too. Either way, it's going to be tedious calculation.
JamesJ
  • JamesJ
although perhaps it would result in a slightly neater arrangement of terms. x^3 + y^3 + z^3 + 3(x^2y + y^2z + z^2x + x^2z + y^2x + z^2y) + 6xyz

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