X2+x-6
————
X2 +8x+15

The detailed simplification is shown below:

Step-by-step explanation:

 Given,

            =    

           = .............simplify to get (x+3) and (x+5) as a common term.

           = ........... take common on numerator and denominator.

           = ...................cancel out the common term (x+3).

Hence,

                              =    

go on the tube you might find some information there

this may not be at all, but i use the same website you're using for school, and if i'm stuck doing one of these i try to look for it on the section.