Algebra/trigonometry

The expression (3-7i)^2 is equivilant to? i know what the answer is im just not sure how to get it please help

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  1. Just expand it
    (3-7i)^2
    = (3-7i)(3-7i)
    = 9 - 42i + 49i^2 , but i^2 = -1
    = 9 - 42i - 49
    = -40 - 42i

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  2. okay thank you

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