Question

Common denominator help please?
My two fractions are
1/x^2+8x+15 (which factored is 1/(x+5)*(x+3))
2/x^2+11x+30 (which factored is 2/(x+5)*(x+6))

I need to add two fractions but cant figure out what to multiply each by in order to get a common denominator!!!

Answer 1

You just combine like terms, x^2+8x+15 + (x^2+11x+30) =

Answer 2

2x^2 + 19x + 45.
If this is not what you were asking about please explain your question better, it may confuse some .

Answer 3

Common denominator...
My 2 fractions are 1/x^2+8x+15 and 2/x^2+11x+30. In order to add fractions, they have to have the same denominator. Simply, to add 1/8 and 1/16 you'd multiply the first by 2/2 in order to get 2/16+1/16. I have to find the common denominator for the two mentioned above.

Answer 4

Please edit your question and put the 1/ , it confused me lol.

Answer 5

well actually, im stumped too. -.-

Answer 6

okay, i don't have it. my brain fails me.

Answer 7

lmaoo poor shamil.

Answer 8

@Luigi0210 HELP ME

Answer 9

Common denomiator should be such that that it should be a multiple of both the denominators

Answer 10

common denominator of (x+5)(x+3) and (x+5)(x+6)
I choose what is common b/n them
(x+5) and then multiply this with the leftovers so I get
(x+5)(x+3)(x+6)
It is just like finding LCM of numbers!!

Answer 11

2x + 9 / (x +5)(x+3)(x+6)

Answer 12

If you looking for how to multiply fractions :

First,
Multiply out the numerators.
Multiply out the denominators.
change the improper fraction to a
mixed fraction and simplify it if possible.

Answer 13

@shami: you did a small mistale........check

Answer 14

*mistake

Answer 15

Oh, forgot its 2/ not 1..

Answer 16

right

Answer 17

Oh my gosh, @atlas you make so much sense.... so easy now that I see it. Thanks guys!!

Answer 18

3(x+4)/(x+5)(x+3)(x+6)

Answer 19

You are welcome @brookew41

Answer 20

@shami: you are right