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Math Help - Algebra2 : Adding and subtracting like Denominators

  1. #1
    Senior Member vaironxxrd's Avatar
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    Algebra2 : Adding and subtracting like Denominators

    Today was my first day in Algebra 2, and I really felt low in self steem since I coulnd't solve some fractions.

    Here is one I din't understand:

    fraction{3X}{X+2} + fraction{6X}{X+2}

    Sorry for not using latex
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  2. #2
    Member anonimnystefy's Avatar
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    Re: Algebra2 : Adding and subtracting like Denominators

    hi

    since the denominators are same you just add the numerators:
    \frac{3x}{x-2}+\frac{6x}{x-2}=\frac{3x+6x}{x-2}=\frac{9x}{x-2}
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    Senior Member vaironxxrd's Avatar
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    Re: Algebra2 : Adding and subtracting like Denominators

    Quote Originally Posted by anonimnystefy View Post
    hi

    since the denominators are same you just add the numerators:
    \frac{3x}{x-2}+\frac{6x}{x-2}=\frac{3x+6x}{x-2}=\frac{9x}{x-2}

    Thanks I thought that only applied if it was like 2, 8 or something similar but now I notice. By the way siorry I messed up it was x+ 2
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    Member anonimnystefy's Avatar
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    Re: Algebra2 : Adding and subtracting like Denominators

    You're welcome.
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    Re: Algebra2 : Adding and subtracting like Denominators

    Just remember the rule:

    \frac{a}{b}+\frac{c}{b}=\frac{a+c}{b}

    When the b is the same you can add/subtract them if they are not the same you can't, only if you change both the b to the same denominator with LCD.
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    Senior Member vaironxxrd's Avatar
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    Re: Algebra2 : Adding and subtracting like Denominators

    Quote Originally Posted by theloser View Post
    Just remember the rule:

    \frac{a}{b}+\frac{c}{b}=\frac{a+c}{b}

    When the b is the same you can add/subtract them if they are not the same you can't, only if you change both the b to the same denominator with LCD.
    Thanks, I know this is not a place to get tutoring I have already talked about that, but besides Khan academy do you recommend any other place that might help me to learn allot. Khan academy is great but I also want to read
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    Re: Algebra2 : Adding and subtracting like Denominators

    Quote Originally Posted by vaironxxrd View Post
    Thanks, I know this is not a place to get tutoring I have already talked about that, but besides Khan academy do you recommend any other place that might help me to learn allot. Khan academy is great but I also want to read
    Start asking people what books are good, and just dive in. Read math books with paper and pen handy. Try to prove theorems yourself before looking at the book's proof. Go as slow as you need to.
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