Question

What is the excluded value for the function posted in the comments? If you could also tell me how you know this, that would be very helpful...

Answer 1

\[y= \frac{ 3 }{ x+4 }\]

Answer 2

There is an important "rule" : you are not allowed to divide by 0
dividing by 0 gives an undefined answer.

in your problem, if x is a certain number, then x+4 becomes 0
you will want to "exclude that x value"

Answer 3

can you figure out what x value makes x+4= 0 ?

Answer 4

-4

Answer 5

so x= -4 is the excluded value

people write x ≠ -4
to show x is not allowed to be -4 (otherwise you end up dividing by 0, and that is bad)

Answer 6

thank you!