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math

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simplify (1+3i)(1-5i)

  • math -

    Multiply them out using the FOIL rule.
    When you get i², replace by -1.

    Using FOIL:
    F=1
    O=-5i
    I=3i
    L=-15i²=15
    Sum like terms:
    (1+3i)(1-5i) = 16-2i

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