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29 June, 13:12

Express 9-y^2 as the product of two binomial factors.

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  1. 29 June, 13:41
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    Recognize the difference of 2 perfect squares

    remember that

    a²-b² = (a-b) (a+b)

    so

    9=3²

    y²=y²

    9-y²=

    3²-y²=

    (3-y) (3+y)
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