Answer
$ (x+3)(x-3)$.
Work Step by Step
The given polynomial is
$= x^2-9$
Write the the polynomial as $a^2-b^2$.
$= x^2-3^2$
Use difference of two square pattern
$a^2-b^2=(a+b)(a-b)$.
We have $a=x$ and $b=3$.
$= (x+3)(x-3)$
Hence, the factor of the polynomial is $ (x+3)(x-3)$.
