Answer
$$x(3x + 1)(3x - 1)$$
Work Step by Step
We see from the binomial that we can factor out an $x$ from both terms to simplify it:
$$x(9x^2 - 1)$$
We see now that we have the difference of two squares, so we use the following formula:
$$A^2 - B^2 = (A + B)(A - B)$$
For this binomial, we take the square root of the leading term $(9x^2)$ to get $A = 3x$ and the square root of the second term $(1)$ to get $B = 1$.
So we now plug these two values into the formula for factoring the binomial:
$$x(3x + 1)(3x - 1)$$
