Minus 3 times 4 is 12, times x to the, 1 less than 3 is 2. And then the derivative of a constant, the slope of a constant you can almost imagine, is 0. It's not changing, a constant by definition isn't changing. So that's f prime of x. So let's figure out the critical points. The critical points are where this thing is either going to be equal to 0 or it's undefined. Now, I could look over the entire domain of real numbers and this thing is defined pretty much anywhere.