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. So 12x squared or equal to 0, which means that x is equal to 0 will make this quantity equal to 0. And then the other thing that would make this quantity 0 is if x minus 1 is equal to 0. So x minus 1 is equal to 0 when x is equal to 1.