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11 April, 10:06

64-81d^2

How do I do this?

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  1. 11 April, 10:25
    0
    It is not clear what you want.

    64=8²

    81d² = (9d) ²

    64-81d²=8² - (9d) ² = (8-9d) (8+9d)

    Is this OK?
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