Factoring by Grouping

[mikey13]

9p^4-6p^3-12p-8
3p^3(3p-2)-4(3p+2)

Is this prime from this point. I have tried every way possible, but I always keep coming back to this point. Someone plz help :?

 

[Denis]

9p^4 - 6p^3 - 12p - 8

Are you sure you typed that correctly? Check the signs.

 

[mikey13]

no I didnt. Thanks, should be 9p^4-6p^3-12p+8, 3p^3(3p-2)-4(3p-2) for an answer of (3p+2)(3p^3-4).