So this interesting, up here the slope was very positive but it was decressing as we went over here notice how it is getting flatter and flatter but it goes to zero and now the slope is incressing again so at this point we want to make a tangent, and notice that the slope has gone up relative to where we were at one so that looks like the slope right over there and we do the slope over there and if we get pretty close it will actully draw the curve of the derivative