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After factoring, you will see that the bottom piece has a hole at x = 3. If the f(x) were continuous, then that hole needs to be filled in.
What y-value would fill in the hole?

Side note: Even after finding the value of h that makes f(x) continuous at x = 3, f(x) will remain discontinuous at x = 0.

Does the derivative exist at the boundary points? In other words, do the slopes agree from the left and the right?