2 Answers

AlexUA · Answer 1 · 2020-07-25T06:10:47+0000

Ration expressions cause excluded values wherever the denominator equals zero.

So, for any expression like

h(x)=(f(x))/(g(x))

-5 is an excluded value if
g(-5)=0

For example, the simplest one would be

h(x) = (1)/(x+5)

In fact, if you try to evaluate this function at -5, you'd have

h(-5)=(1)/(5+5)=(1)/(0)

which is undefined, and thus you can't evaluate the function, and thus -5 is an excluded value.

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