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You can't SOLVE something unless it's an EQUATION. You have to know what x2-9 is equal to.
Do you mean x2 - 9? You can FACTOR x2 - 9 into (x + 3)(x - 3).
If your equation is x2 - 9 = 0 then (x + 3)(x - 3) = 0, and the solution of that is
either x = 3 or x = -3
f(x) = x2 - 9 is the equation of a quadratic equation. It's solution set comprises infinitely many points on the parabola x2 - 9. There is not a single, or even a finite number of solutions which can be given in answer.
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