Factor the numerator and denominator, cancel any like terms. After simplification, if there is any you will set your two factored binomials of the denominator equal to zero and solve for x.... you do know how to factor a trinomial, right?
You could either factor the denominator using a method like grouping, or you could complete the square (quadratic formula) to find your zeros. You want to find all numbers x such that f(x) = 0.
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