What real values of $x$ are not in the domain of

$f(x)=\frac{1}{|x^2-6x+8|+|x^2+x-6|}$?
Question:
What real values of $x$ are not in the domain of

$f(x)=\frac{1}{|x^2-6x+8|+|x^2+x-6|}$?
Answer:
Let's think step by step.

user
2
What real values of $x$ are not in the domain of

$f(x)=\frac{1}{|x^2-6x+8|+|x^2+x-6|}$?
train