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23 May, 13:32

Find the product.

(-d + 4) (-d - 4)

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  1. 23 May, 16:37
    0
    Use foil

    f: - d * - d = d^2

    o: - d*-4 = 4d

    i: 4 * - d = - 4d

    l: - 4 * 4 = - 16

    d^2 + 4d - 4d - 16

    d^2 - 16 The middle two terms cancel out.
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