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9 February, 19:51

Which of the following polynomials is the expansion of (1/2x-y) ^4

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  1. 9 February, 20:32
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    Hello:

    (1/2x-y) ^4 = (1/2x-y) ² (1/2x-y) ²

    but : (1/2x-y) ² = (1/2) ² - 2 (1/2) xy + y²

    so : (1/2x-y) ^4 = ((1/2) ² - 2 (1/2) xy + y²) ((1/2) ² - 2 (1/2) xy + y²) = ...
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