How do you factor

?

The first thing I tried was grouping:

That's not going to work, so I tried factoring out an x and then factoring the trinomial. However, I never got past factoring the trinomial...

I've gotten as far as

However, I cannot factor the trinomial. I made a list of every possible combination of the factors of 18 and the factors of 85, and their results. None of them added up to -57.

Factors of 18:

Factors of 85:

After that, I made the long list of these sums:

(I put in the plus/ minus to save time, since switching the negative would change nothing.)

You get it. I went through every possible combination, but never got to a +-57.

So how do I get the answer: