Well we could factor out a 12x. So if we factor out a 12x, then this term becomes just x, and then actually let's factor out a 12x squared. We factor out a 12x squared, if we divide both of these by 12x squared, this term just becomes an x, and then minus 12x squared divided by 12x squared is just 1, is equal to 0. I just rewrote this top thing like this. You could go the other way, if I distributed this 12x squared times this entire quantity, you would get my derivative right there. So the reason why I did that is because to solve for 0, or if I want all of the x's that make this equation equal to 0, I now have written it in a form where I'm multiplying one thing by another thing. And in order for this to be 0, one or both of these things must be equal to 0.