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28 September, 20:34

How to turn this into expanded form, 9 (x-4) (x+4) (x-5i) (x+5i)

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  1. 28 September, 21:14
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    9 (x-4) (x+4) (x-5i) (x+5i)

    9x-36 (x+4) (x-5i) (x+5i)

    9x (x+4) 36 (x+4) x (x+5i) - 5i (x+5i)

    9xsquared + 36x+36x+144+xsquared+5xi-5xi-25x squared.

    9xsquared + 72x+25i squared+144
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