And this is indeed one of our integration properties. If our upper bound here is the same as our lower bound here and we are integrating the same thing, well, then you can merge these two definite integrals in this way. And this is just going to be this entire area, but because we are below the x-axis and above our curve here it would be the negative of that area. So this is going to be equal to negative seven. Let's do another example. Let's say someone were to ask you, walk up to you on the street and say, quick, here's a graph, what is the value of the expression that I'm about to write down? The definite integral going from zero to four of f of x, dx, plus the definite integral going from four to six of f of x, dx.