Which value(s) of x should be excluded for the polynomial?
x squared minus 16 over x squared minus 6x + 9
A. 3
B. 3 and -3
C. 4
D. 4 and -4
(x^2 - 16)/(x^ - 6x + 9)
= (x^2 - 16)/(x-3)^2
The only thing we have to worry about is not dividing by zero.
This will happen if x = 3
so the exclusion: x = 3 , looks like A)