For the function f(x)= l x-5 l find the domain and the range. Must show work and write answer using interval notation.

2 Answers

sciencesolve's profile pic

sciencesolve | Teacher | (Level 3) Educator Emeritus

Posted on

You need to use absolute value definition for |x - 5| such that:

`|x - 5| = x - 5 if x - 5 gt 0 =gt x gt 5 =gt x in (5,oo)` `|x - 5| = 0 if x - 5 = 0 =gt x = 5` `|x- 5| = 5 - x if x - 5 lt 0 =gt x lt 5 =gt x in (-oo,5)`

Notice that the values of x cover all real set, hence domain of function f(x)=|x-5| is R set.

You should notice that the values of the function are always positive for any value of x, hence the range of function is the interval [0,oo).

Sketching the graph of the function below, you may notice that the graph is symmetric to y axis.

Hence, the domain of the function is R set and the range is `[0,oo)` .

justaguide's profile pic

justaguide | College Teacher | (Level 2) Distinguished Educator

Posted on

This question has been answered at: