The zeros of the function are -3 or 3
Here, we want to find the zero of the function
To find this, we will have to equate the function to zero
Thus, we have it that;
[tex]\begin{gathered} x^2-9\text{ = 0} \\ x^2\text{ = 9} \\ x\text{ = }\sqrt[]{9} \\ x\text{ = }\pm3 \end{gathered}[/tex]