So based on the given expression above, that factor of <span>3x3 + 18x2 + 27x would be x + 3. So the answer is the third option. So how did we get x + 3. Firstly, we factor the given expression by 3x. So, it would look like this. 3x (x+3)(x+3). Hope this is the answer that you are looking for. </span>
