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17 September, 00:02

4. (a² + 3) (a² - 3)

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  1. 17 September, 00:29
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    Step-by-step explanation:

    (a² + 3) (a² - 3)

    Opening the bracket

    = a^4 - 3a^2 + 3a^2 - 9

    = a^4 - 9
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