Answer:
The interval is (1,4]
Explanation:
We have to find the interval over which the value of f(x) is 5, that means the line segment where the y value is 5,
We see that the interval is,
(1,4] here, we do not include 1 so we have normal bracket and 4 is included so we have the square bracket,and we see that on this interval, y = 5