Algebra

for this expression to be undefined, y^2-3y-2=0

sum of equation of the form ax^2+bx+c is -b/a (product is c/a)

sum of this equation is 3

JP

What is the sum of all values of y for which the expression (y + 6)/(y^2 - 3y - 2) is undefined?

The denominator cannot be 0

$y^2-3y-2 \ne 0\\ y\ne\frac{3\pm\sqrt{9+8}}{2}\\ $

So as JP said, the sum of these is 3