What is the answer? trying hard here

You basically have to use the quadratic formula to solve this since there are no factors of - 9 which add to give 6.

Then you use

To find which numbers will go into what place inside the quadratic equation.

So a = 1 (because x is alone)
b = 6
c = -9

Then you solve it. I've included a picture of how I did it and I got the answer x=-3+-3sqrt2