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7 April, 17:28

If x - y = 9, then x2 - 2xy + y2 =

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  1. 7 April, 17:49
    0
    81

    Step-by-step explanation:

    Note the expansion of

    (x - y) ² = x² - 2xy + y², thus

    x² - 2xy + y² = (x - y) ² = 9² = 81
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