I tried just about every online calculator they had but they said its not factorable
It is not factorable. As far as I know, there is only way to resolve this.
First, let's do FOIL. I do not know if you are familiar with this.
(x- )(x+ )
(x+ )(x+ )
(x- )(x- )
INNER & OUTER will be
? times ?=+5
+1 times +5 =5
-1 times -5 =5
There is no other option.
I believe there was a typographical error in the equation. Please re-check it. If there is not, then this must be the factoring result...
I hope this helps. Please let me know if you need anything else.