# Algebra2 : Adding and subtracting like Denominators

• Sep 6th 2011, 01:09 PM
vaironxxrd
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
• Sep 6th 2011, 01:12 PM
anonimnystefy
Re: Algebra2 : Adding and subtracting like Denominators
hi

since the denominators are same you just add the numerators:
$\frac{3x}{x-2}+\frac{6x}{x-2}=\frac{3x+6x}{x-2}=\frac{9x}{x-2}$
• Sep 6th 2011, 01:18 PM
vaironxxrd
Re: Algebra2 : Adding and subtracting like Denominators
Quote:

Originally Posted by anonimnystefy
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
• Sep 6th 2011, 02:08 PM
anonimnystefy
Re: Algebra2 : Adding and subtracting like Denominators
You're welcome.
• Sep 6th 2011, 02:52 PM
theloser
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.
• Sep 6th 2011, 06:00 PM
vaironxxrd
Re: Algebra2 : Adding and subtracting like Denominators
Quote:

Originally Posted by theloser
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
• Sep 6th 2011, 07:08 PM
Ackbeet
Re: Algebra2 : Adding and subtracting like Denominators
Quote:

Originally Posted by vaironxxrd
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.