## Introductory Algebra for College Students (7th Edition)

$$x(3x + 1)(3x - 1)$$
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: $$x(3x + 1)(3x - 1)$$