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Math Help - adding and subtracting radicals and fractions

  1. #1
    Junior Member Cait's Avatar
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    Red face adding and subtracting radicals and fractions

    I think they are radicals anyway >_> heres some probs from my HW that i didnt get.
    Code:
    11. *figured it out*
    
    31. *figured out*
    
    
    41.
    
    Find LCD
    
     9                   3
    ---    and     ---
    8x              2x+4
    
    answer: 8x(x+2)
    
    
    
    
    59.
    
    
     9         (blank) 
    ---   =    -----
    x+3       2(x+3)
    
    
    and
    
    63.
    
       x                        (blank)
    -----             =        -----
    x^2+6x+8         (X+4)(X+2)(X+1)
    Hopefully those will format correctly..

    anyway.

    My book does a horrible job of showing how to do these.. -__-.. and purple math doesnt help me much either.


    Thanks so much
    ~Cait
    Last edited by Cait; April 3rd 2007 at 05:43 PM. Reason: adding
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  2. #2
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by Cait View Post
    bump? plz! this shouldnt be that hard!
    you are right for 41.
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  3. #3
    Junior Member Cait's Avatar
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    ..I know those answers are right i got em out of the book!

    What i need is how they GOT those answers lol.
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  4. #4
    is up to his old tricks again! Jhevon's Avatar
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    59.

    9/(x+3) = 9/(x+3) * (2/2) = 2*9/2(x+3) = 18/2(x+3)

    so the blank is 18

    notice that we had a fraction where the denominator increased by a factor of 2. to maintain equality, that is, to keep the fraction at the same value it was before, the numerator also had to increase by factor of 2
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  5. #5
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by Cait View Post
    ..I know those answers are right i got em out of the book!

    What i need is how they GOT those answers lol.
    o ok, sorry, i thought you came up with that. ok here's how:
    Attached Thumbnails Attached Thumbnails adding and subtracting radicals and fractions-lcm.gif  
    Last edited by Jhevon; April 3rd 2007 at 08:06 PM.
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  6. #6
    is up to his old tricks again! Jhevon's Avatar
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    Here's 63
    Attached Thumbnails Attached Thumbnails adding and subtracting radicals and fractions-frac.gif  
    Last edited by Jhevon; April 3rd 2007 at 08:08 PM.
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