Results 1 to 2 of 2

Math Help - LCD Question

  1. #1
    Newbie
    Joined
    May 2010
    Posts
    22

    Question LCD Question

    I am trying to figure out how to find the lowest common denominator when the denominator has addition in it. I would really like to see this one worked out. Here is the problem, and the answer the book gave:

    (5/(2x+4)) + (3/(x+2)) = 2

    answer was 3/4

    What was the LCD I should multiply by?

    Thanks!
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Super Member bigwave's Avatar
    Joined
    Nov 2009
    From
    honolulu
    Posts
    580
    your LCD should be 2(x+2)

    multilply all terms by this and simplify you should get \frac{3}{4}

    thus assumming cancelation:

    \frac{5}{LCD} + \frac{6}{LCD} = \frac{4(x+2)}{LCD}

    5+6 = 4x+8

    3=4x

    <br />
\frac{3}{4}=x
    Last edited by bigwave; May 17th 2010 at 02:06 PM. Reason: spelling, more steps
    Follow Math Help Forum on Facebook and Google+

Search Tags


/mathhelpforum @mathhelpforum