Yea, that expression is not easily manually-factored.  I can offer a couple of tips, as shown in the image. 

-9 factors to 3*(-3), hence (x+3)(x-3) are easily arrived as a good first step. 

36 factors to (-9)(-4), which can be factored to (-9)(2^2)(-1), leading to (x+2)^2 and (x-1) as good factors. 

The sums which lead to the prime '-31' will then support those factors.