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October 23, 2014

October 23, 2014

Posted by **Margie** on Saturday, February 24, 2007 at 9:00pm.

x^2 2x-15

----- *------

x^2-9 x^2-9

*I don't get this at alll.Plz help me.

I assume you are trying to add, since the problem says "find the sum" and express in simplest form.

x^2/(x^2-9) + (2x-15)/(x^2-9)

You have a common denominator (x^2-9), so you can just add the numerators (top numbers) together.

Here's how it works out:

(x^2 + 2x - 15)/(x^2-9)

Can we simplify this further? Yes!

Let's factor both the numerator and denominator first:

(x + 5)(x - 3)/(x + 3)(x - 3)

You have a common factor in both the numerator and denominator. Cancel out that common factor to simplify.

That should be all you need to do!

so then will it turn out to be:

(x+5)/(x+3)

Correct!

- Please Help Me Math -
**ricardo**, Tuesday, May 17, 2011 at 5:09pmhi

- Please Help Me Math -
**ricardo**, Tuesday, May 17, 2011 at 5:10pmhelp me

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