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13 March, 08:24

What is (x+3i) (x-3i) (x+1) (x-1) multiplied out?

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  1. 13 March, 09:50
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    We can start with the first two sets

    (x+3i) (x-3i) = x²-9i² then simplify it to x²+9

    multiply the next two

    (x+1) (x-1) = x²-1

    then multiply those two together

    (x²+9) (x²-1) = x∧4-x²+9x²-9

    combine like terms x∧4+8²-9

    that is your answer
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