And we need to find the equation for the tangent line. So the tangent line will look something like that. And to figure out this equation, we just really figure out its slope, and then we know a point that it's on, and we could either use point slope, or you could just use your kind of standard slope intercept form to give an equation for that line. So the first part, let's figure out its slope. And the slope of the tangent line is going to be the same slope as the slope of our function at that point. Or another way to think about it, it is going to be f prime of 1 half, or the derivative evaluated at 1 half. The derivative gives us the slope of that line at any point.