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9 February, 17:44

What is the product of (4x-7) (4x+7) ?

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  1. 9 February, 18:12
    0
    (a+b) (a-b) = a^2 - b^2

    so

    (4x-7) (4x+7) = 16x^2 - 49

    answer

    16x^2 - 49
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