I notice there is an x^2 but not a z^2.
So i know my answer will be like this:
(Something x +or- z) (something x +or- 3)
I need a 3x so it will be
(x +or- z) (x +or- 3)
I need a positive 4x^2 and a negative 4xz so it would be
(x-z) (4x-3)
"Find value" isn't clear to me, did you mean when x= -2 and z = -3?