Joseph H. answered • 10/31/15

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Tutor with Electrical Engineering and Computer Science Degrees

It's hard to tell from the equation you wrote if the expression is

(-x+4)/13 or -x + (4/13)

Either way though the answer will be the same. If you have some expression such as 2/x then it is a problem if x=0 because anything divided by 0 is an undefined quantity.

For example:

8/1=8

8/2=4

8/8=1

8/0=undefined

Therefore, with rational expressions such as (x+2)/(x-1) we do not want to allow the denominator to be 0. Thus, we say that x cannot be any value that would make the denominator 0.

If the expressions was (x+2)/(x-1) then we would say x cannot be 1 because then (x-1)=(1-1)=0 and (x-1) is the denominator.

In the expression you gave in the question, there is no x in the denominator. Thus, we don't have to restrict the values of x at all!