The Seventh Gate As you approach the seventh gate, you notice that it is only a short distance to the area where your computer indicated the communication device was stored. You look past the gate hopefully, as your computer translates: The passcode for this gate is found by determining the domain of the derivative of f(x) and then evaluating the derivative at x 47. Enter the domain in interval notation. f(x)=2-86x 86 Domain of f'(x): (0, -infinity) f'() -301