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algebra maginary numbers

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(3+4i)(3-4i)

  • algebra maginary numbers -

    just expand it as if the i was a variable

    (3+4i)(3-4i)
    = 9 - 12i + 12i -12i^2, now remember i^2 = -1
    = 9 - 12(-1)
    = 9+12
    = 21

  • algebra maginary numbers -

    wait when you factor it wouldnt it be 9-12i+12i-16i^2

  • algebra maginary numbers -

    of course, my silly error

  • algebra maginary numbers -

    its totally cool you have helped alot :)

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