This right over here is going to be, this is going to be 4.36 comma L of 4.36. This line evaluated when x is equal to 4.36. And what is that going to be? What is that going to be equal to? Well let's see, let's just evaluate it. L of 4.36 is going to be f of four. So it's going to be two plus the derivative, so the slope of this line, plus f prime of four times x minus four.