Question 271081
If you mean 
x^2+2x-15 Then you need to reverse FOIL

(     )(      )
(x    )(x     ) Will give you x^2
(x+5  )(x-3   ) WIll give you x^2+2x-15

When using reverse FOIL remember: What times what will give me -15 but added together will give me 2.