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9 June, 14:26

Solve this equation using an algebraic method: (x + 4) (x - 4) = 9.

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  1. 9 June, 14:34
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    Sure!

    (x+4) (x-4) = 9

    x^2 + 4x-4x - 16 = 9

    x^2 - 16 = 9

    x^2 = 25

    x = - 5

    x = 5
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