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2 July, 14:49

Find the product of (x + 3) (x - 3). a. x2 - 6x + 9 b. x2 + 6x + 9 c. x2 + 9 d. x2 - 9

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  1. 2 July, 14:56
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    Distribute

    if we have

    (a+b) (c+d) = (a+b) (c) + (a+b) (d) = (ac) + (bc) + (ad) + (bd) so

    the way I like it is

    x times x=x^2

    3 times x=3x

    x times - 3=-3x

    3 times - 3=-9

    add them together

    x^2 + 3x-3x-9

    x^2-9 is the naswer
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