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21 January, 15:29

How to solve (4s+5t) (4s-5t)

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  1. 21 January, 15:30
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    (4s+5t) (4s-5t)

    16s^2 - 20st + 20st - 25t^2

    Combine like terms ...

    -20st + 20st = 0

    The answer is:

    16s^2 - 25t^2
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