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write the expression -5i(1 + 3i) as a complex number in standard form.

  • math -

    well, break it up:

    -5i : 5@-90
    1+3i: sqrt10 @arctan3

    now multiply them

    5sqrt10 @(-90+71.56) now that angle, after adding 360, is 341.56

    5sqrt10 (.9486 -316i)

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