Question 823125
Find the value(s) of x in the domain of f(x)= -x^2+4x+1 for which f(x) = -4.
------
Solve: 
-x^2 + 4x + 1 = -4
------
-x^2 + 4x + 5 = 0
------
x^2 -4x - 5 = 0
Factor:
(x-5)(x+1) = 0
x = 5 or x = -1
====================
Cheers,
Stan H.