trigonometry

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Simplify and write in standard form.

1.)
(radical 3 + i radical 15)(radical 3 - i radical 15)


2.)
8 + 16i / 2i

Thanks again everyone. Any help is appreciated.

  • trigonometry -

    1.
    (√3 + i√15)(√3 - i√15)
    = 3 - 15i^2
    = 3 - 15(-1) = 18

    2. I am pretty sure you meant:
    (8+16i)(2i)

    = (8 + 16i)/(2i) * i/i
    = (8i + 16i^2)/(2i^2)
    = (8i - 16)/-2
    = 8 - 4i

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