Algebra2 : Adding and subtracting like Denominators

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September 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
September 6th 2011, 01:12 PM
anonimnystefy

Re: Algebra2 : Adding and subtracting like Denominators

hi

since the denominators are same you just add the numerators:
$\frac{3x}{x-2}+\frac{6x}{x-2}=\frac{3x+6x}{x-2}=\frac{9x}{x-2}$
September 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
September 6th 2011, 02:08 PM
anonimnystefy

Re: Algebra2 : Adding and subtracting like Denominators

You're welcome.
September 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.
September 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
September 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.