0

# is it possible to evaluate ƒ(x) = 5/x-1 when x=1 ? If so, what is ƒ(1)? If not explain why not.

is it possible to evaluate ƒ(x) = 5/x-1 when x=1 ?  If so, what is ƒ(1)?  If not explain why not.

### 2 Answers by Expert Tutors

Vivian L. | Microsoft Word/Excel/Outlook, essay composition, math; I LOVE TO TEACHMicrosoft Word/Excel/Outlook, essay comp...
3.0 3.0 (1 lesson ratings) (1)
1
Hi again Ryan;
f(x)
This means evaluate x as x.
f(1)
This means evaluate x as 1.

ƒ(x) = 5/x-1
ƒ(1) = 5/x-1
ƒ(1) = (5/1)-1
ƒ(1) = 5-1
ƒ(1)=4
Jason S. | My goal is the success of my students. Knowledge-Patience-HonestyMy goal is the success of my students. K...
4.9 4.9 (115 lesson ratings) (115)
0
Note that Vivian is correct if the problem was f(x) = (5/x) - 1 or 5/x - 1 due to order of operations.

Just in case you meant f(x) = 5/(x-1):

No, you can't evaluate it for x=1.

x=1 would be a vertical asymptote.

f(1) = 5/(1-1) = 5/0, which would be undefined.

The graph of 5/(x-1) is 1/x, shifted one unit right, and stretched by a factor of 5.