What is the sum of all values of $x$ for which the expression $\frac{x-3}{x^2-10x+16}$ is undefined?
\( \frac{x-3}{x^2-10x+16} \)
Factor the denominator as ( x - 8) ( x - 2)
Note that if x = 8 or x = 2 then the denominator will be = 0
So......these are the two values where the rational function is undefined
And the sum of these = 10
+383 
