Final answer:
The values of x that make the expression undefined in (x²+4x+3)/(x²-9) are x = 3 and x = -3.
Step-by-step explanation:
To identify which values of x are undefined in the expression (x²+4x+3)/(x²-9), we need to find the values of x that make the denominator equal to zero. In this case, the denominator is x²-9. So, we set x²-9 equal to zero and solve for x:
x²-9 = 0
(x-3)(x+3) = 0
x-3 = 0 or x+3 = 0
x = 3 or x = -3
Therefore, the values of x that make the expression undefined are x = 3 and x = -3.