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anthony~

Expand (x - 2y)4. A: x4 + 8x3y + 24x2y2 + 32xy3 + 16y4 B: x4 - 8x3y + 24x2y2 - 32xy3 + 16y4 C: x4 - 8x3y + 24x2y2 - 34xy3 + 16y4 D: x4 - 8x3y + 28x2y2 - 32xy3 + 16y4

  • one year ago
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  1. Voidus
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    aren't they all the same?

    • one year ago
  2. anthony~
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    not really.

    • one year ago
  3. anthony~
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    i think its x^4 - 8x^3y + 24x^2y^2 - 32xy^3 + 16y^4 (B)

    • one year ago
  4. amistre64
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    they only differ in sign changes

    • one year ago
  5. Voidus
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    @amistre64 actually that and the coefficients.

    • one year ago
  6. amistre64
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    ...28 and 34 .... sneaky

    • one year ago
  7. anthony~
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    the numbers are different too. the numbers, signs and all that. they're not the same. none of them.

    • one year ago
  8. amistre64
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    1 4 6 4 1 pascal row x x x x 1 power down 1 -2y -2y -2y -2y power up -------------------

    • one year ago
  9. anthony~
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    x^4 - 8x^3y + 24x^2y^2 - 32xy^3 + 16y^4??

    • one year ago
  10. amistre64
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    http://www.wolframalpha.com/input/?i=expand+%28x+-+2y%29%5E4 but yeah, B is good

    • one year ago
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