Now, once again, this might look like kind of fancy notation to you, but when you see an example, it'll make it pretty clear. If I want to take the derivative with respect to x of, let's say, x to the third power plus x to the negative 4 power, this just tells us that the derivative of the sum is just the sum of the derivatives. So we can take the derivative of this term using the power rule. So it's going to be 3x squared. And to that, we can add the derivative of this thing right over here. So it's going to be plus, that's a different shade of blue, plus, and over here is negative 4, so it's plus negative 4 times x to the negative 4 minus 1, or x to the negative 5 power. So we have, and I can just simplify a little bit, this is going to be equal to 3x squared minus 4x to the negative 5.