It goes, it's tangent to f right at two comma three, and it goes through the point seven comma six. And so we don't know anything other than f, but we can imagine what f looks like. Our function f could, so our function f, it could look something like this. It just has to be tangent. So that line has to be tangent to our function right at that point. So our function f could look something like that. So when they say find f prime of two, they're really saying what is the slope of the tangent line when x is equal to two?