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Math Help - Another

  1. #1
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    May 2008
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    Another

    2- Subtract then, simplify

    _ 3___ _ _ 2___
    X - 4 X2- 16

    formCheckList.addElement(new Check_Answer({ref_label:"3",name:"mc-ans-_8413334_1"}));
    a.
    LCD = (X - 4)(X + 4) then, answer is; _3X + 10
    LCD

    b.
    LCD = X2 - 4 then, answer is; _3X + 14 LCD

    c.
    LCD = (X - 4)(X + 4) then, answer is; _3X + 14 LCD

    d.
    LCD = (X - 4)(X + 4) then, answer is; _3X - 10 LCD
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  2. #2
    Banned
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    Nov 2007
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    Is this a multiple choice question?

    It is difficult to read from where I am, but looks like a simple item.

    Can you write it in plain text, i.e, (2x+7)/(x-1) or whatever?

    The formatting is not working well and I don't want to guess.
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  3. #3
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    May 2008
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    Check out the attachment... Should be easier to read
    Attached Thumbnails Attached Thumbnails Another-problem.bmp  
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  4. #4
    Behold, the power of SARDINES!
    TheEmptySet's Avatar
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    Yuma, AZ, USA
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    Quote Originally Posted by rdfisch View Post
    Check out the attachment... Should be easier to read
    Here is a link to help with La Tex (the built in my type on this site)

    http://www.mathhelpforum.com/math-he...-tutorial.html

    The code for a fraction is \frac{3}{x-4}-\frac{2}{x^2-16}

    To open the math tags click on the sigma \sum(next to the you Tube link). Where I put the above into the math tags I get...

    \frac{3}{x-4}-\frac{2}{x^2-16}

    First to find the LCD we want to factor the denominator so we get

    \frac{3}{x-4}-\frac{2}{(x-4)(x+4)}

    Now we notice that the first fraction is missing an x+4 so we build it to get a common denominator

    \frac{3}{x-4}\frac{(x+4)}{(x+4)}-\frac{2}{(x-4)(x+4)}

    Simplifying we get

    \frac{3x+12}{(x+4)(x-4)}-\frac{2}{(x-4)(x+4)}=\frac{3x+10}{(x-4)(x+4)}

    Good luck.
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