We've already thought about what a definite integral means. If I'm taking the definite integral from a to b of f of x dx, I can just view that as the area below my function f, so if this is my y axis, this is my x axis, and y is equal to f of x, so something like that, y is equal to f of x, and if this is a and if this is b, I could just view this expression as being equal to this area, but what if my function was not above the x axis? What if it was below the x axis? So these are going to be equivalent. Let's say, let me just draw that scenario, so let me draw a scenario where it's my x axis, that is my y axis, and let's say I have, let's say I have a function that looks like that, so that is y is equal to g of x, and let's say that this right over here is a, and this right over here is b, and let's say that this area right over here is equal to five. Well, if I were to ask you what is the definite integral from a to b of g of x dx, what do you think it is going to be? Well, you might be tempted to say, hey, well, it's just the area again between my curve and the x axis.