Expand and simplify (x+3)(x-3)(3x+2)

In order to expand this expression, we need to first multiply 2 of the terms and then use the solution to multiply the last term. In this case,

We will first multiply (x+3)(x-3),

x^2-3x+3x-9, we can simplify this to x^2-9

Now we multiply (x^2-9) and (3x+2)

3x^3+2x^2-27x-18

This cannot be simplified any further so your final answer is

3x^3+2x^2-27x-18