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What is the answer to this?

(2i-6) (3i-9)

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  1. 28 May, 18:12
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    Remember that i² = - 1. Using FOIL ...

    (2i-6) (3i-9) = 6i²-36i+54

    Now simplify by subbing in - 1 for i².

    6 (-1) - 36i+54 = 48-36i

    answer: 48-36i
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