charles funcion
it is any function without (x+2)(x-3)(x-5) in the deonmenator
so it can be like
f(x)=3x+4
dividing by zero is undefined so
f(x)=

would be a place where the function is undefined at x=-2,x=3 and x=5
charles: f(x)=3x+4
bobby: f(x)=

there is no function where both are correct, it cannot be both defined and undefined