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Math Help - Need Help(vertex, quadratic formula etc.

  1. #1
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    Need Help(vertex, quadratic formula etc.

    Ok have another test coming up so Im trying to do some review questions. Here they are. There are only 7 so if you only look at one I would be so greatful. I had issues with every one of them besides the first which was a simple one. I think I got them right though based on my end result. And if not thanks in advance for clearing things up. Like I said any help would be really great.
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  2. #2
    Junior Member
    Joined
    Oct 2008
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    The answer to 2 is not 'B'; rather it is 'A'

    (4-2i)(5+i)

    =20+4i-10i-2i^2
    =20+4i-10i-2(-1)~negatives become positive-this is where you went wrong
    =20-6i+2
    =22-6i or 'A'

    I might do a few more but in the mean time I have my own work to do
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  3. #3
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    Thanks appreciate it. Thank you for taking time out of your own work to help me. I hope thats the only one I did wrong, probably not im confused
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