What is the excluded value?
a/b-2

1. a=0
2. b=2
3. b=-2
4. none of the above

B - 2 = 0 since you cannot divide by 0
b = 2 solve for b. this is where the function is undefined

The answer is why would a teacher ask that

“exterior angles of triangles. an exterior (or external) angle is the angle between one side of a triangle and the extension of an adjacent side. try this drag the orange dots on any vertex to reshape the triangle.” look to get to the answer i explained what it means and other things i hope it you .