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27 September, 21:30

Which expression is equivalent to (x + y) (x - y) ?

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Answers (2)
  1. 28 September, 00:01
    0
    We can't see any choices but it doesn't matter. That's the factorization of the difference of two squares. It's important to recognize either side when you see it; the usual next move is to replace it with the other side.

    (x + y) (x - y) = x² - y²

    Answer: x² - y²
  2. 28 September, 00:17
    0
    X^2-y^2

    you would get x^2+xy-xy+y^2

    the xy and - xy cancel
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