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: